A box has 1 rupee, 50 paise and 25 paise coins in the ratio 3 : 2 : 5 worth Rs. 252. The number of 25 paise coins in the box is = ?

Answer: Option C

Ratio of coin's Rs. 1 : 50p : 25P = 3 : 2 : 5

Ratio of coin's value
Rs. 1 : 50p : 25p (value) = 3 : 1 : 1.25
(Multiply by 4 to remove the fraction value in above ratio)
i.e Rs. 1 : 50p : 25p (value) = 12 : 4 : 5

Value of 25p coin in Rs. 252 = $$\frac{5}{21}\times 252=60$$
Number of 25p coin is = 60 × 4 = 240