Question

7. Difference between a number and its three-fifth is 40 . Identify the number. a) 80 b) 100 c) 90 d) 120

Answer 1

currect answer is 100

Answer 2

let, the number be 'x' 

therefore,

x - 3x/5 = 40

2x/5 = 40 

x = 40×5/2 = 100

therefore, value of x is 100.

so option (b) is correct.

Answer 3

Correct answer is (b)

Let the number be x.

then, it's three-fifth is 3x/5 .

Now,

x-3x/5= 40     (difference given in question)

5x-3x/5 =40

= 2x/5=40

2x= 200

so, x= 100✓