Problems on Average
Q41. Three-fifth of the square of a certain number is 126.15. What is the number
(a) 13.7
(b) 14.5
(c) 14.9
(d) 15.2
Answer: (b) 14.5
Let the number be x
| A/Q x2 X | 3 | = 126.15 |
| 5 |
| ⇒ x2 = | 126.15 X 5 |
| 5 |
⇒ x2 = 210.25
⇒ x = √ 210.25 = 14.5
Practice Test Exam