#### Chapters

Chapter 2: Rational Numbers

Chapter 3: Fractions (Including Problems)

Chapter 4: Decimal Fractions (Decimals)

Chapter 5: Exponents (Including Laws of Exponents)

Chapter 6: Ratio and Proportion (Including Sharing in a Ratio)

Chapter 7: Unitary Method (Including Time and Work)

Chapter 8: Percent and Percentage

Chapter 9: Profit, Loss and Discount

Chapter 10: Simple Interest

Chapter 11: Fundamental Concepts (Including Fundamental Operations)

Chapter 12: Simple Linear Equations (Including Word Problems)

Chapter 13: Set Concepts (Some Simple Divisions by Vedic Method)

Chapter 14: Lines and Angles (Including Construction of angles)

Chapter 15: Triangles

Chapter 16: Pythagoras Theorem

Chapter 17: Symmetry (Including Reflection and Rotation)

Chapter 18: Recognition of Solids (Representing 3-D in 2-D)

Chapter 19: Congruency: Congruent Triangles

Chapter 20: Mensuration

Chapter 21: Data Handling

Chapter 22: Probability

## Chapter 12: Simple Linear Equations (Including Word Problems)

### Selina solutions for Concise Mathematics Class 7 ICSE Chapter 12 Simple Linear Equations (Including Word Problems) Exercise 12 (A)

**Solve the following equation:**

x + 5 = 10

**Solve the following equation:**

2 + y = 7

**Solve the following equation:**

a – 2 = 6

**Solve the following equation:**

x – 5 = 8

**Solve the following equation:**

5 – d= 12

**Solve the following equation:**

3p = 12

**Solve the following equation:**

14 = 7m

**Solve the following equation:**

2x = 0

**Solve the following equation:**

`"x"/9 = 2`

**Solve the following equation:**

`"y"/-12 = - 4`

**Solve the following equation:**

8x - 2 = 38

**Solve the following equation:**

2x + 5 = 5

**Solve the following equation:**

5x – 1 = 74

**Solve the following equation:**

14 = 27 - x

**Solve the following equation:**

10 + 6a = 40

**Solve the following equation:**

`"c" - 1/2 = 1/3`

**Solve the following equation:**

`"a"/15 - 2 = 0`

**Solve the following equation:**

12 = c – 2

**Solve the following equation:**

4 = x - 2.5

**Solve the following equation:**

`"y" + 5 = 8 1/4`

**Solve the following equation:**

`"x" + 1/4 = - 3/8`

**Solve the following equation:**

p + 0.02 = 0.08

**Solve the following equation:**

`"p" - 12 = 2 2/3`

**Solve the following equation:**

- 3x = 15

**Solve the following equation:**

1.3b = 39

**Solve the following equation:**

`5/8 "n" = 20`

**Solve the following equation:**

`3/16 "m" = 21`

**Solve the following equation:**

2a – 3 =5

**Solve the following equation:**

3p – 1 = 8

**Solve the following equation:**

9y -7 = 20

**Solve the following equation:**

2b – 14 = 8

**Solve the following equation:**

`7/10`x + 6 = 41

**Solve the following equation:**

`5/12`m - 12 = 48

### Selina solutions for Concise Mathematics Class 7 ICSE Chapter 12 Simple Linear Equations (Including Word Problems) Exercise 12 (B)

8y – 4y = 20

9b – 4b + 3b = 16

5y + 8 = 8y – 18

6 = 7 + 2p -5

8 – 7x = 13x + 8

4x – 5x + 2x = 28 + 3x

9 + m = 6m + 8 – m

24 = y + 2y + 3 + 4y

19x + 13 -12x + 3 = 23

6b + 40 = – 100 – b

6 – 5m – 1 + 3m = 0

0.4x – 1.2 = 0.3x + 0.6

6(x+4) = 36

9 (a+ 5) + 2 = 11

4 ( x- 2 ) = 12

-3 (a - 6) = 24

7 (x - 2) = 2 (2x - 4)

(x - 4) (2x + 3 ) = 2x²

21 – 3 (b - 7) = b+ 20

x (x + 5) = x² +x + 32

### Selina solutions for Concise Mathematics Class 7 ICSE Chapter 12 Simple Linear Equations (Including Word Problems) Exercise 12 (C)

Solve: `"x"/2 + "x" = 9`

Solve: `"x"/5 + "2x" = 33`

Solve: `"3x"/4 + "4x" = 38`

Solve: `"x"/2 + "x"/5 = 14`

Solve: `"x"/3 - "x"/4 = 2`

Solve: `"y" + "y"/2 = 7/4 - "y"/4`

Solve: `"4x"/3 - "7x"/3 = 1`

Solve: `1/2"m" + 3/4"m" - "m" = 2.5`

Solve: `"2x"/3 + "x"/2 - "3x"/4 = 1`

Solve: `"3a"/4 + "a"/6 = 66`

Solve: `"2p"/3 - "p"/5 = 35`

Solve: 0.6a +0.2a = 0.4 a + 8

Solve: p + 1.4p = 48

Solve: 10% of x = 20

Solve: y + 20% of y = 18

Solve: x – 30% of x = 35

Solve: `("x" + 4)/2 + "x"/3 = 7`

Solve: `("y" + 2)/3 + ("y" + 5)/4 = 6`

Solve: `("3a" - 2)/7 - ("a" - 2)/4 = 2`

Solve: `1/2 ("x" + 5) - 1/3 ("x" - 2) = 4`

Solve: `("x - 1")/2 - ("x - 2")/3 - ("x - 3")/4 = 0`

Solve: `("x + 1")/3 + ("x + 4")/5 = ("x - 4")/7`

Solve: 15 – 2 (5 - 3x) = 4 (x - 3) + 13

Solve: `(2"x" + 1)/("3x" - 2) = 1 1/4`

Solve: 21 – 3 (x – 7) = x + 20

Solve: `(3"x" - 2)/7 - ("x" - 2)/4 = 2`

Solve: `("2x" - 3)/3 - ("x" - 5) = "x"/3`

Solve: `("x" - 4)/7 = "x + 3"/7 + "x + 4"/5`

Solve: `("x - 1")/5 - "x"/3 = 1 - "x - 2"/2`

Solve: 2x + 20% of x = 12.1

### Selina solutions for Concise Mathematics Class 7 ICSE Chapter 12 Simple Linear Equations (Including Word Problems) Exercise 12 (D)

One-fifth of a number is 5, find the number.

Six times a number is 72, find the number.

If 15 is added to a number, the result is 69, find the number.

The sum of twice a number and 4 is 80, find the number.

The difference between a number and one- fourth of itself is 24, find the number.

Find a number whose one-third part exceeds its one-fifth part by 20.

A number is as much greater than 35 as is less than 53. Find the number.

The sum of two numbers is 18. If one is twice the other, find the numbers.

A number is 15 more than the other. The sum of of the two numbers is 195. Find the numbers.

The sum of three consecutive even numbers is 54. Find the numbers.

The sum of three consecutive odd numbers is 63. Find the numbers.

A man has ₹ x from which he spends ₹6. If twice of the money left with him is ₹86, find x.

A man is four times as old as his son. After 20 years, he will be twice as old as his son at that time. Find their present ages.

If 5 is subtracted from three times a number, the result is 16. Find the number.

Find three consecutive natural numbers such that the sum of the first and the second is 15 more than the third.

The difference between two numbers is 7. Six times the smaller plus the larger is 77. Find the numbers.

The length of a rectangular plot exceeds its breadth by 5 m. If the perimeter of the plot is 142 m, find the length and the breadth of the plot.

The numerator of a fraction is four less than its denominator. If 1 is added to both, is numerator and denominator, the fraction becomes `1/2` Find the fraction.

A man is thrice as old as his son. After 12 years, he will be twice as old as his son at that time. Find their present ages.

A sum of ₹ 500 is in the form of notes of denominations of ₹ 5 and₹ 10. If the total number of notes is 90, find the number of notes of each type.

## Chapter 12: Simple Linear Equations (Including Word Problems)

## Selina solutions for Concise Mathematics Class 7 ICSE chapter 12 - Simple Linear Equations (Including Word Problems)

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Concepts covered in Concise Mathematics Class 7 ICSE chapter 12 Simple Linear Equations (Including Word Problems) are Simple Linear Equations in One Variable, Concept for Inequalities, Concept for Solution of Simple Inequalities in One Variable, Simple Linear Equations in One Variable.

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