Three fifth of the square of a certain number is 126.15.

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

1. 210.25
2. 75.69
3. 14.5
4. 145

Correct Option: C

Let the number be x
According to the question

3	of x² = 126.15
5

⇒ x² =	126.15 × 5
	3

⇒ x² = 210.25
∴ x = √210.25 = 14.5