Discussion Forum



1)

Three fifth of the square of certain number is 126.15.What is the number?


A) 210.25

B) 75.69

C) 14.5

D) 145

E) 15.5

Answer:

Option C

Explanation:

Let the umber be x

Given $\frac{3}{5}x^{2}=126.15$

$x^{2}=\frac{126.15\times5}{3}$

$x=\sqrt{210.25}$

=14.5