Three-fifth of the square of a certain number is What is the number?

Three-fifth of the square of a certain number is What is the number?

A 14.5

B 75.69

C 145

D 210.25

Solution

Correct Answer: Option A

Let the number be x.Then,

3/5x2= 126.15.

x2=(126.15 X 53)= 210.25.

x=√210.25 = 14.5