Three-fifth the square of a certain number is 126.15. What is the number?
A
14.5
B
75.69
C
145
D
210.25
Correct Answer: 14.5
Hints: Let, the certain number be x 3/5 × x2 = 126.15 x2 = 126.15 ×( 5/3) x2 = 210.25 x = 14.5