# NCERT Class 7 Mathematics Solutions: Chapter 4 –Simple Equations Exercise 4.4 Part 1

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1. Set up equations and solve them to find the unknown numbers in the following cases:

(a) Add to eight times a number; you get .

(b) One-fifth of a number minus gives .

(c) If I take three-fourth of a number and add to it, I get .

(d) When I subtracted from twice a number, the result was .

(e) Munna subtracts thrice the number of notebooks he has from , he finds the result to be .

(f) Ibenhal thinks of a number. If she adds to it divides the sum by , she will get .

(g) Answer thinks of a number. If he takes away from of the number, the result is .

Answer:

(a) Consider the number be

times of this number

Dividing both sides by

(b) Consider the number be

One-fifth of this number

(c) Consider the number be

Three-fourth of this number

Multiplying both sides by

Dividing both sides by

(d) Consider the number be

Twice of this number

(e) Consider the number of books be

Thrice the number of books

Dividing both sides by

(f) Consider the number be .

Multiplying both sides by

(g) Consider the number be

of this number

Multiplying both sides by

Diving both sides by