Contents

## Selina Concise Mathematics Class 7 ICSE Solutions Chapter 12 Simple Linear Equations (Including Word Problems)

**Selina Publishers Concise Mathematics Class 7 ICSE Solutions Chapter 12 Simple Linear Equations (Including Word Problems)**

### Simple Linear Equations Exercise 12A – Selina Concise Mathematics Class 7 ICSE Solutions

Solve the following equations :

Question 1.

x + 5 = 10

Solution:

Question 2.

2 + y = 7

Solution:

Question 3.

a – 2 = 6

Solution:

Question 4.

x – 5 = 8

Solution:

Question 5.

5 – d= 12

Solution:

Question 6.

3p = 12

Solution:

Question 7.

14 = 7m

Solution:

Question 8.

2x = 0

Solution:

Question 9.

\(\frac { x }{ 9 }\) = 2

Solution:

Question 10.

\(\frac { y }{ -12 }\) = -4

Solution:

Question 11.

8x-2 =38

Solution:

Question 12.

2x + 5 = 5

Solution:

Question 13.

5x – 1 = 74

Solution:

Question 14.

14 = 27-x

Solution:

Question 15.

10 + 6a = 40

Solution:

Question 16.

Solution:

Question 17.

Solution:

Question 18.

12 = c – 2

Solution:

Question 19.

4 = x- 2.5

Solution:

Question 20.

Solution:

Question 21.

Solution:

Question 22.

p + 0.02 = 0.08

Solution:

Question 23.

Solution:

Question 24.

Solution:

Question 25.

1.3b = 39

Solution:

Question 26.

Solution:

Question 27.

Solution:

Question 28.

2a – 3 =5

Solution:

Question 29.

3p – 1 = 8

Solution:

Question 30.

9y -7 = 20

Solution:

Question 31.

2b – 14 = 8

Solution:

Question 32.

Solution:

Question 33.

Solution:

### Simple Linear Equations Exercise 12B – Selina Concise Mathematics Class 7 ICSE Solutions

Question 1.

8y – 4y = 20

Solution:

Question 2.

9b – 4b + 3b = 16

Solution:

Question 3.

5y + 8 = 8y – 18

Solution:

Question 4.

6 = 7 + 2p -5

Solution:

Question 5.

8 – 7x = 13x + 8

Solution:

Question 6.

4x – 5x + 2x = 28 + 3x

Solution:

Question 7.

9 + m = 6m + 8 – m

Solution:

Question 8.

24 = y + 2y + 3 + 4y

Solution:

Question 9.

19x -+ 13 -12x + 3 = 23

Solution:

Question 10.

6b + 40 = – 100 – b

Solution:

Question 11.

6 – 5m – 1 + 3m = 0

Solution:

Question 12.

0.4x – 1.2 = 0.3x + 0.6

Solution:

Question 13.

6(x+4) = 36

Solution:

Question 14.

9 ( a+ 5) + 2 = 11

Solution:

Question 15.

4 ( x- 2 ) = 12

Solution:

Question 16.

-3 (a- 6 ) = 24

Solution:

Question 17.

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

Solution:

Question 18.

(x-4) (2x +3 ) = 2x²

Solution:

Question 19.

21 – 3 ( b-7 ) = b+ 20

Solution:

Question 20.

x (x +5 ) = x² +x + 32

Solution:

### Simple Linear Equations Exercise 12C – Selina Concise Mathematics Class 7 ICSE Solutions

Solve

Question 1.

Solution:

Question 2.

Solution:

Question 3.

Solution:

Question 4.

Solution:

Question 5.

Solution:

Question 6.

Solution:

Question 7.

Solution:

Question 8.

Solution:

Question 9.

Solution:

Question 10.

Solution:

Question 11.

Solution:

Question 12.

0.6a +0.2a = 0.4 a +8

Solution:

Question 13.

p + 104p= 48

Solution:

Question 14.

10% of x = 20

Solution:

Question 15.

y + 20% of y = 18

Solution:

Question 16.

x – 13% of x = 35

Solution:

Question 17.

Solution:

Question 18.

Solution:

Question 19.

Solution:

Question 20.

Solution:

Question 21.

Solution:

Question 22.

Solution:

Question 23.

15 – 2 (5-3x ) = 4 ( x-3 ) + 13

Solution:

Question 24.

Solution:

Question 25.

21 – 3 (x – 7) = x + 20

Solution:

Question 26.

Solution:

Question 27.

Solution:

Question 28.

Solution:

Question 29.

Solution:

Question 30.

2x + 20% of x = 12.1

Solution:

### Simple Linear Equations Exercise 12D – Selina Concise Mathematics Class 7 ICSE Solutions

Question 1.

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

Solution:

Question 2.

Six times a number is 72, find the number.

Solution:

Question 3.

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

Solution:

Question 4.

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

Solution:

Question 5.

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

Solution:

Question 6.

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

Solution:

Question 7.

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

Solution:

Question 8.

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

Solution:

Question 9.

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

Solution:

Question 10.

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

Solution:

Question 11.

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

Solution:

Question 12.

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

Solution:

Question 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.

Solution:

Question 14.

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

Solution:

Question 15.

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

Solution:

Question 16.

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

Solution:

Question 17.

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

Solution:

Question 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 \(\frac { 1 }{ 2 }\) Find the fraction.

Solution:

Question 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.

Solution:

Question 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.

Solution: