Subtracting 40%

Question

Subtracting 40% of a number from the number , we get the result as 30. The number is :

Options:

A . 28

B . 50

C . 52

D . 70

Answer: Option B

Let the number be `x . Then , x - 40% of x = 30`

`hArr x - 40/100 x = 30 hArr x - 2/5 x = 30 hArr (3x)/(5) = 30 hArr x = ((30 xx 5)/(3))` = 50.

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