Question
A number of boys raised Rs. 400 for a famine relief fund, each boy giving as many 25 paise coins as there were boys. The number of boys was -
Answer: Option A $$\eqalign{
& {\text{Let number of boys}} = x \cr
& {\text{Number of 25 paise coins}} = {x^2} \cr
& {\text{According to question,}} \cr
& \frac{{{x^2}}}{4} = 400 \cr
& {x^2} = 1600 \cr
& x = 40\,\, \cr} $$
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