Discussion Forum



1)

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


A) 14.5

B) 75.69

C) 145

D) 210.25

Answer:

Option A

Explanation:

Let the number be x .then ,
$\frac{3}{5}x^{2}=126.15$
$=> x^{2}= (126.15 \times\frac{5}{3})-210.25$
$=> x=\sqrt{210.25}=14.5$