Question

What number is increased by 40% become 28?
a.5 b. 10 c. 15 d. 20​

Answer 1

d. 20

Explanation:

28 ÷ (100%+40%)

= 28 ÷ 140%

= 28 ÷ 1.4 = 20

Answer 2

option d

Explanation:

Let the number be x

40% of x = 0.40x

Increased by 40% = 28

That is ,

x + 0.40x = 28

1.40x = 28

`x = (28)/(1.40)\\`

`x = (28 * 100)/(1.40 * 100 ) = (28 * 100)/(140) =(4 * 100)/(20) = 4 * 5 = 20`

Therefore, the number is 20