Explanation : The ratio of the number of ₹1, 50 paise and 25 paise coins is 5 : 6 : 8. Therefore, the ratio of their contribution in ₹210 is = 5 : 6/2 : 8/2. i. e. 5 : 3 : 4. Contribution of ₹1 coins in ₹210 = 5/(5 + 3 + 2) x 210. = 105 ∴ Number of ₹1 coins = 105.