Given: Ratio of 1, 2 and 5 rupees coins = 3: 7 : 5 Calculations: Let the ratio be x According to questions, ⇒1(3x) + 2(7x) + 5(5x) = 252 ⇒ 3x + 14x + 25x = 252 ⇒ 42x = 252 ⇒ x = 6. Number of 2 rupees coins = 6 × 7 = 42 ∴ Number of Rs. 2 coins in the bag is 42