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

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

Exercise 12 (A)Exercise 12 (B)Exercise 12 (C)Exercise 12 (D)
Exercise 12 (A)

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

Exercise 12 (A) | Q 1

Solve the following equation:

x + 5 = 10

Exercise 12 (A) | Q 2

Solve the following equation:

2 + y = 7

Exercise 12 (A) | Q 3

Solve the following equation:

a – 2 = 6

Exercise 12 (A) | Q 4

Solve the following equation:

x – 5 = 8

Exercise 12 (A) | Q 5

Solve the following equation:

5 – d= 12

Exercise 12 (A) | Q 6

Solve the following equation:

3p = 12

Exercise 12 (A) | Q 7

Solve the following equation:

14 = 7m

Exercise 12 (A) | Q 8

Solve the following equation:

2x = 0

Exercise 12 (A) | Q 9

Solve the following equation:

"x"/9 = 2

Exercise 12 (A) | Q 10

Solve the following equation:

"y"/-12 = - 4

Exercise 12 (A) | Q 11

Solve the following equation:

8x - 2 = 38

Exercise 12 (A) | Q 12

Solve the following equation:

2x + 5 = 5

Exercise 12 (A) | Q 13

Solve the following equation:

5x – 1 = 74

Exercise 12 (A) | Q 14

Solve the following equation:

14 = 27 - x

Exercise 12 (A) | Q 15

Solve the following equation:

10 + 6a = 40

Exercise 12 (A) | Q 16

Solve the following equation:

"c" - 1/2 = 1/3

Exercise 12 (A) | Q 17

Solve the following equation:

"a"/15 - 2 = 0

Exercise 12 (A) | Q 18

Solve the following equation:

12 = c – 2

Exercise 12 (A) | Q 19

Solve the following equation:

4 = x - 2.5

Exercise 12 (A) | Q 20

Solve the following equation:

"y" + 5 = 8 1/4

Exercise 12 (A) | Q 21

Solve the following equation:

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

Exercise 12 (A) | Q 22

Solve the following equation:

p + 0.02 = 0.08

Exercise 12 (A) | Q 23

Solve the following equation:

"p" - 12 = 2 2/3

Exercise 12 (A) | Q 24

Solve the following equation:

- 3x = 15

Exercise 12 (A) | Q 25

Solve the following equation:

1.3b = 39

Exercise 12 (A) | Q 26

Solve the following equation:

5/8 "n" = 20

Exercise 12 (A) | Q 27

Solve the following equation:

3/16 "m" = 21

Exercise 12 (A) | Q 28

Solve the following equation:

2a – 3 =5

Exercise 12 (A) | Q 29

Solve the following equation:

3p – 1 = 8

Exercise 12 (A) | Q 30

Solve the following equation:

9y -7 = 20

Exercise 12 (A) | Q 31

Solve the following equation:

2b – 14 = 8

Exercise 12 (A) | Q 32

Solve the following equation:

7/10x + 6 = 41

Exercise 12 (A) | Q 33

Solve the following equation:

5/12m - 12 = 48

Exercise 12 (B)

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

Exercise 12 (B) | Q 1

8y – 4y = 20

Exercise 12 (B) | Q 2

9b – 4b + 3b = 16

Exercise 12 (B) | Q 3

5y + 8 = 8y – 18

Exercise 12 (B) | Q 4

6 = 7 + 2p -5

Exercise 12 (B) | Q 5

8 – 7x = 13x + 8

Exercise 12 (B) | Q 6

4x – 5x + 2x = 28 + 3x

Exercise 12 (B) | Q 7

9 + m = 6m + 8 – m

Exercise 12 (B) | Q 8

24 = y + 2y + 3 + 4y

Exercise 12 (B) | Q 9

19x + 13 -12x + 3 = 23

Exercise 12 (B) | Q 10

6b + 40 = – 100 – b

Exercise 12 (B) | Q 11

6 – 5m – 1 + 3m = 0

Exercise 12 (B) | Q 12

0.4x – 1.2 = 0.3x + 0.6

Exercise 12 (B) | Q 13

6(x+4) = 36

Exercise 12 (B) | Q 14

9 (a+ 5) + 2 = 11

Exercise 12 (B) | Q 15

4 ( x- 2 ) = 12

Exercise 12 (B) | Q 16

-3 (a - 6) = 24

Exercise 12 (B) | Q 17

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

Exercise 12 (B) | Q 18

(x - 4) (2x + 3 ) = 2x²

Exercise 12 (B) | Q 19

21 – 3 (b - 7) = b+ 20

Exercise 12 (B) | Q 20

x (x + 5) = x² +x + 32

Exercise 12 (C)

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

Exercise 12 (C) | Q 1

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

Exercise 12 (C) | Q 2

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

Exercise 12 (C) | Q 3

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

Exercise 12 (C) | Q 4

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

Exercise 12 (C) | Q 5

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

Exercise 12 (C) | Q 6

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

Exercise 12 (C) | Q 7

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

Exercise 12 (C) | Q 8

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

Exercise 12 (C) | Q 9

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

Exercise 12 (C) | Q 10

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

Exercise 12 (C) | Q 11

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

Exercise 12 (C) | Q 12

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

Exercise 12 (C) | Q 13

Solve: p + 1.4p = 48

Exercise 12 (C) | Q 14

Solve: 10% of x = 20

Exercise 12 (C) | Q 15

Solve: y + 20% of y = 18

Exercise 12 (C) | Q 16

Solve: x – 30% of x = 35

Exercise 12 (C) | Q 17

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

Exercise 12 (C) | Q 18

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

Exercise 12 (C) | Q 19

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

Exercise 12 (C) | Q 20

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

Exercise 12 (C) | Q 21

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

Exercise 12 (C) | Q 22

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

Exercise 12 (C) | Q 23

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

Exercise 12 (C) | Q 24

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

Exercise 12 (C) | Q 25

Solve: 21 – 3 (x – 7) = x + 20

Exercise 12 (C) | Q 26

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

Exercise 12 (C) | Q 27

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

Exercise 12 (C) | Q 28

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

Exercise 12 (C) | Q 29

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

Exercise 12 (C) | Q 30

Solve: 2x + 20% of x = 12.1

Exercise 12 (D)

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

Exercise 12 (D) | Q 1

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

Exercise 12 (D) | Q 2

Six times a number is 72, find the number.

Exercise 12 (D) | Q 3

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

Exercise 12 (D) | Q 4

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

Exercise 12 (D) | Q 5

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

Exercise 12 (D) | Q 6

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

Exercise 12 (D) | Q 7

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

Exercise 12 (D) | Q 8

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

Exercise 12 (D) | Q 9

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

Exercise 12 (D) | Q 10

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

Exercise 12 (D) | Q 11

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

Exercise 12 (D) | Q 12

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

Exercise 12 (D) | Q 13

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.

Exercise 12 (D) | Q 14

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

Exercise 12 (D) | Q 15

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

Exercise 12 (D) | Q 16

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

Exercise 12 (D) | Q 17

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.

Exercise 12 (D) | Q 18

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.

Exercise 12 (D) | Q 19

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.

Exercise 12 (D) | Q 20

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)

Exercise 12 (A)Exercise 12 (B)Exercise 12 (C)Exercise 12 (D)

## 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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