A number of boys raised ₹ 400 for a famine relief fund,

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A number of boys raised ₹ 400 for a famine relief fund, each boy giving as many 25 paise coins as there were boys. The number of boys was :

1. 40
2. 16
3. 20
4. 100

Correct Option: A

Let the number of boys = x
∴ Number of 25 paise coins= x²
According to question,

25	× x² = 400
100

⇒	x²	= 400 ⇒ x² = 1600
	4

⇒ x = √1600 = 40