A collection of coins contains 25 paise, 10 paise, and 5 paise coins in the ratio 1 : 2 : 3. If the total amount is Rs. 30, how many 5 paise coins are present?

Explanation

Let the number of 25p, 10p, and 5p coins be x, 2x, and 3x respectively. The total value is (25x + 10*2x + 5*3x) paise = (25x + 20x + 15x) = 60x paise. Since Rs. 30 = 3000 paise, we have 60x = 3000, so x = 50. Therefore, the number of 5p coins is 3x = 3*50 = 150.