#### Chapters

Chapter 2: Banking (Recurring Deposit Account)

Chapter 3: Shares and Dividend

Chapter 4: Linear Inequations (In one variable)

Chapter 5: Quadratic Equations

Chapter 6: Solving (simple) Problems (Based on Quadratic Equations)

Chapter 7: Ratio and Proportion (Including Properties and Uses)

Chapter 8: Remainder and Factor Theorems

Chapter 9: Matrices

Chapter 10: Arithmetic Progression

Chapter 11: Geometric Progression

Chapter 12: Reflection

Chapter 13: Section and Mid-Point Formula

Chapter 14: Equation of a Line

Chapter 15: Similarity (With Applications to Maps and Models)

Chapter 16: Loci (Locus and Its Constructions)

Chapter 17: Circles

Chapter 18: Tangents and Intersecting Chords

Chapter 19: Constructions (Circles)

Chapter 20: Cylinder, Cone and Sphere

Chapter 21: Trigonometrical Identities

Chapter 22: Height and Distances

Chapter 23: Graphical Representation

Chapter 24: Measure of Central Tendency(Mean, Median, Quartiles and Mode)

Chapter 25: Probability

#### Selina Selina ICSE Concise Mathematics Class 10

## Chapter 7: Ratio and Proportion (Including Properties and Uses)

#### Selina solutions for Class 10 Maths Chapter 7 Exercise Exercise 7(A) [Pages 0 - 88]

if a : b = 5:3 find `(5a - 3b)/(5a + 3b)`

If x: y = 4: 7, find the value of (3x + 2y): (5x + y).

If a : b = 3 : 8. Find the value of `(4a + 3b)/(6a - b)`

If (a – b): (a + b) = 1: 11, find the ratio (5a + 4b + 15): (5a – 4b + 3).

Find the number which bears the same ratio to `7/33` that `8/21` does to `4/9`.

If `(m + n)/(m + 3n) = 2/3` find `(2n^2)/(3m^2 + mn)`

Find x/y when `x^2 + 6y^2 =5xy`

If the ratio between 8 and 11 is the same as the ratio of 2x - y to x + 2y, find the value of `(7"x")/(9"y")`

Divide Rs 1,290 into A,B and C such that A is `2/5` of B and B : C = 4 : 3.

A school has 630 students. The ratio of the number of boys to the number of girls is 3 : 2. This ratio changes to 7 : 5 after the admission of 90 new students. Find the number of newly admitted boys.

What quantity must be subtracted from each term of the ratio 9: 17 to make it equal to 1: 3?

The monthly pocket money of Ravi and Sanjeev are in the ratio 5:7. Their expenditures are in the ratio 3:5. If each saves Rs. 80 every month, find their monthly pocket money.

The work done by (x – 2) men in (4x + 1) days and the work done by (4x + 1) men in (2x – 3) days are in the ratio 3: 8. Find the value of x.

The bus fare between two cities is increased in the ratio 7: 9. Find the increase in the fare, if:

(i) the original fare is Rs 245;

(ii) the increased fare is Rs 207.

By increasing the cost of entry ticket to a fair in the ratio 10: 13, the number of visitors to the fair has decreased in the ratio 6: 5. In what ratio has the total collection increased or decreased?

In a basket, the ratio between the number of oranges and the number of apples is 7: 13. If 8 oranges and 11 apples are eaten, the ratio between the number of oranges and the number of apples becomes 1: 2. Find the original number of oranges and the original number of apples in the basket.

In a mixture of 126 kg of milk and water, milk and water are in ratio 5 : 2. How much water must be added to the mixture to make this ratio 3 : 2?

If A: B = 3: 4 and B: C = 6: 7, find A: B: C

find:

(i) A: B: C (ii) A: C

If A : B = 2 : 5 and A : C = 3 : 4, find A : B : C

If 3A = 4B = 6C; find A: B: C.

If 2a = 3b and 4b = 5c, find: a : c.

Find the compound ratio of 2 : 3, 9: 14 and 14: 27

Find the compound ration of 2a: 3b, mn: `x^2` and x: n

Find the compound ratio of `sqrt2: 1, 3: sqrt5` and `sqrt20: 9`

Find the duplicate ratio of 3: 4

Find the duplicate ratio of `3sqrt3: 2sqrt5`

Find the triplicate ratio of 1 : 3

Find the triplicate ration of `m/2: n/3`

Find the sub-duplicate ratio of 9: 16

Find the sub-duplicate ratio of `(x - y)^4 : (x + y)^6`

Find the sub-triplicate ratio of 64: 27

Find the sub-triplicate ratio of `x^3: 125y^3`

Find the reciprocal ratio of:

5 : 8

Find the reciprocal ratio of `x/3 : y/7`

If (x + 3) : (4x + 1) is the duplicate ratio of 3 : 5, find the value of x.

If m: n is the duplicate ratio of m + x: n + x; show that x^{2} = mn.

If (3x - 9) : (5x + 4) is the triplicate ratio of 3 : 4, find the value of x.

Find the ratio compounded of the reciprocal ratio of 15: 28, the sub-duplicate ratio of 36: 49 and the triplicate ratio of 5: 4.

If r^{2 }_{=}pq, show that p : q is the duplicate ratio of (p + r) : (q + r).

If (p - x) : (q - x) be the duplicate ratio of p : q then show that : `1/"p" + 1/"q" = 1/"x"`

#### Selina solutions for Class 10 Maths Chapter 7 Exercise Exercise 7(B) [Page 94]

Find the fourth proportional to 1.5, 4.5 and 3.5

Find the fourth proportional to 3a, 6a^{2} and 2ab^{2}

Find the third proportional to `2 2/3 and 4`

Find the third proportional to a - b and `a^2 - b^2`

Find the mean proportional between `6 + 3sqrt3 and 8 - 4sqrt3`

Find the mean proportional between `a - b and a^3 - a^2b`

If x + 5 is the mean proportional between x + 2 and x + 9; find the value of x.

If x^{2}, 4 and 9 are in continued proportion, find x.

What least number must be added to each of the numbers 6, 15, 20 and 43 to make them proportional?

If a,b,c are in continued proportion,

show that: `("a"^2 + "b"^2)/("b"("a" + "c")` = `("b"("a" + "c"))/("b"^2 + "c"^2)`

If a, b, c are in continued proportion and a(b -c) = 2b,

prove that: a - c= `(2("a" + "b"))/"a"`

If `"a"/"b" = "c"/"d"`, show that: `(a^3c + ac^3)/(b^3d + bd^3) = ("a" + "c")^4/("b" + "d")^4`

What least number be subtracted from each of the numbers 7, 17 and 47 so that the remainders are in continued proportion?

If y is the mean proportional between x and z; show that xy + yz is the mean proportional between x^{2}+y^{2} and y^{2}+ z^{2}.

If q is the mean proportional between p and r, show that: pqr (p + q + r)^{3} = (pq + qr + rp)^{3}

If three quantities are in continued proportion; show that the ratio of the first to the third is the duplicate ratio of the first to the second

If y is the mean proportional between x and z. prove that `(x^2 - y^2 + z^2)/(x^(-2) - y^(-2) + z^(-2)) = y^4`

Given four quantities a, b, c and d are in proportion. Show that `(a - c)b^2 : (b - d)cd = (a^2 - b^2 - ab) : (c^2 - d^2 - cd)`

Find two numbers such that the mean proportional between them is 12 and the third proportional to them is 96.

Find the third proportional to `x/y + y/x` and `sqrt(x^2 + y^2)`

If p: q = r: s; then show that: mp + nq : q = mr + ns : s.

If p + r = mq and `1/q + 1/s = m/r` then prove that p : q = r : s

#### Selina solutions for Class 10 Maths Chapter 7 Exercise Exercise 7(C) [Pages 101 - 102]

If a : b = c : d, prove that: 5a + 7b : 5a – 7b = 5c + 7d : 5c – 7d.

If a : b = c : d, prove that: (9a + 13b) (9c – 13d) = (9c + 13d) (9a – 13b).

If a : b = c : d, prove that: xa + yb : xc + yd = b : d.

If a : b = c : d, prove that: (6a + 7b) (3c – 4d) = (6c + 7d) (3a – 4b).

Given `a/b = c/d` prove that `(3a - 5b)/(3a + 5b) = (3c - 5d)/(3c + 5d)`

If `(5x + 6y)/(5u + 6v) = (5x - 6y)/(5u - 6v)` then prove that x : y = u : v

If (7a + 8b) (7c – 8d) = (7a – 8b) (7c + 8d), prove that a: b = c: d.

if x = `(6ab)/(a + b)` find the value of `(x + 3a)/(x - 3a) = (x + 3b)/(x - 3b)`

If a = `(4sqrt6)/(sqrt2 + sqrt3)` find the value of `(a + 2sqrt2)/(a - 2sqrt2) + (a + 2sqrt3)/(a - 2sqrt3)`

If (a + b + c + d) (a – b – c + d) = (a + b – c – d) (a – b + c – d), prove that a: b = c: d.

If `(a - 2b - 3c + 4d)/(a + 2b - 3c - 4d) = (a - 2b + 3c - 4d)/(a + 2b + 3c + 4d)` show that 2ad = 3bc

If `(a^2 + b^2)(x^2 + y^2)` = (ax + by)^2 ; prove that `a/x = b/y`

If a, b, and c are in continued proportion, prove that `(a^2 + ab + b^2)/(b^2 + bc + c^2) = a/c`

If a, b, c are in continued proportion, prove that `(a^2 + b^2 + c^2)/(a + b + c)^2 = (a - b + c)/(a + b + c)`

Using properties of proportion solve for x

`(sqrt(x + 5) + sqrt(x - 16))/(sqrt(x + 5) - sqrt(x - 16)) = 7/3`

Using properties of proportion solve for x:

`(sqrt(x + 1) + sqrt(x - 1))/(sqrt(x + 1) - sqrt(x - 1)) = (4x - 1)/2`

Using properties of proportion solve for x:

`(3x + sqrt(9x^2 - 5))/(3x - sqrt(9x^2 - 5)) = 5`

If x = `(sqrt(a + 3b) + sqrt(a - 3b))/(sqrt(a + 3b) - sqrt(a - 3b))` prove that `3bx^2 - 2ax + 3b = 0`

Using the properties of proportion solve for x given `(x^4 + 1)/(2x^2) = 17/8`

If `x = (sqrt(m + n) + sqrt(m - n))/(sqrt(m + n) - sqrt(m - n))` express n in terms of x and m

If `(x^2 + 3xy^2)/(3x^2y + y^3) = (m^2 + 3mn^2)/(3m^2n + n^3)` show that nx = my

#### Selina solutions for Class 10 Maths Chapter 7 Exercise Exercise 7(D) [Pages 102 - 103]

If a: b = 3: 5, find: (10a + 3b): (5a + 2b)

If 5x + 6y: 8x + 5y = 8: 9, find x: y.

If (3x – 4y): (2x – 3y) = (5x – 6y): (4x – 5y), find x: y.

Find the duplicate ratio of `2sqrt2 : 3sqrt5`

Find the triplicate ratio of 2a: 3b

Find the sub-duplicate ratio of 9x^{2}a^{4 }: 25y^{6}b^{2}

Find the sub-triplicate ratio of 216: 343

Find the reciprocal ratio of 3: 5

Find the ratio compounded of the duplicate ratio of 5: 6, the reciprocal ratio of 25: 42 and the sub-duplicate ratio of 36: 49.

Find the value of x, if: (2x + 3): (5x – 38) is the duplicate ratio of `sqrt5: sqrt6`

Find the value of x, if: (2x + 1): (3x + 13) is the sub-duplicate ratio of 9: 25.

Find the value of x, if: (3x – 7): (4x + 3) is the sub-triplicate ratio of 8: 27.

What quantity must be added to each term of the ratio x: y so that it may become equal to c: d?

A woman reduces her weight in the ratio 7 : 5. What does her weight become if originally it was 84 kg?

If 15(2x^{2} – y^{2}) = 7xy, find x: y; if x and y both are positive.

Find the fourth proportional to 2xy, x^{2} and y^{2}.

Find the third proportional to a^{2} – b^{2} and a + b.

Find the mean proportional to (x – y) and (x^{3} – x^{2}y).

Find two numbers such that the mean proportional between them is 14 and third proportional to them is 112.

If x and y be unequal and x: y is the duplicate ratio of x + z and y + z, prove that z is mean proportional between x and y.

if x = `(2ab)/(a + b)` find the value of `(x + a)/(x - a) + (x +b)/(x - b)`

If (4a + 9b) (4c – 9d) = (4a – 9b) (4c + 9d), prove that: a: b = c: d.

if `a/b = c/d` show that `(a + b) : (c + d) = sqrt(a^2 + b^2) : sqrt(c^2 + d^2)`

There are 36 members in a student council in a school and the ratio of the number of boys to the number of girls is 3: 1. How any more girls should be added to the council so that the ratio of the number of boys to the number of girls maybe 9: 5?

If 7x – 15y = 4x + y, find the value of x: y. Hence, use componendo and dividend to find the values of:

`(9x + 5y)/(9x - 5y)`

If 7x – 15y = 4x + y, find the value of x: y. Hence, use componendo and dividend to find the values of:

`(3x^2 + 2y^2)/(3x^2 - 2y^2)`

If `(4m + 3n)/(4m - 3n) = 7/4` use properties of proportion to find m : n

If `(4m + 3n)/(4m - 3n) = 7/4` use properties of proportion to find `(2m^2 - 11n^2)/(2m^2 + 11n^2)`

If x, y, z are in continued proportion prove that `(x + y)^2/(y + z)^2 = x/z`

Given x = `(sqrt(a^2 + b^2) + sqrt(a^2 - b^2))/(sqrt(a^2 + b^2) + sqrt(a^2 - b^2))`

Use componendo and dividendo to prove that b^2 = (2a^2x)/(x^2 + 1)

If `(x^2 + y^2)/(x^2 - y^2) = 2 1/8` find `x/y`

if `(x^2 + y^2)/(x^2 - y^2) = 2 1/8` find `(x^3 + y^3)/(x^3 - y^3)`

Using componendo and dividendo find the value of x

`(sqrt(3x + 4) + sqrt(3x - 5))/(sqrt(3x + 5) - sqrt(3x - 5)) = 9`

If `x = (sqrt(a + 1) + sqrt(a - 1))/(sqrt(a + 1) + sqrt(a - 1))`, using properties of proportion show that `x^2 - 2ax + 1 = 0`

Given `("x"^3 + 12"x")/(6"x"^2 + 8) = ("y"^3 + 27"y")/(9"y"^2 + 27)`

using componendo and dividendo, find x : y

If `"x"/"a" = "y"/"b" = "z"/"c"` show that:

`"x"^3/"a"^3 + "y"^3/"b"^3 + "z"^3/"c"^3 = (3"xyz")/("abc")`

If b is the mean proportion between a and c, show that:

`("a"^4 + "a"^2"b"^2 + "b"^4)/("b"^4 + "b"^2"c"^2 +"c"^4) = "a"^2/"c"^2`

If `(7"m" + 2"n")/(7"m" - 2"n") = 5/3` use properties of proportion to find:

(i) m : n

(ii) `("m"^2 + "n"^2)/("m"^2 - "n"^2)`

If x and y both are positive and (2x^{2}- 5y^{2}): xy = 1: 3, find x: y.

Find x, if `16(("a" - "x")/("a" + "x"))^3 = ("a" + "x")/("a" - "x")`

## Chapter 7: Ratio and Proportion (Including Properties and Uses)

#### Selina Selina ICSE Concise Mathematics Class 10

## Selina solutions for Class 10 Mathematics chapter 7 - Ratio and Proportion (Including Properties and Uses)

Selina solutions for Class 10 Maths chapter 7 (Ratio and Proportion (Including Properties and Uses)) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Selina ICSE Concise Mathematics for Class 10 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 10 Mathematics chapter 7 Ratio and Proportion (Including Properties and Uses) are Ratios, Proportions, Componendo and Dividendo Properties, Alternendo and Invertendo Properties, Direct Applications, Ratio and Proportion Example.

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