A bag contains 3 kinds of coins in the following ratios : The number of 5 dollar coins : the number of 2 dollar coin : the number of 1 dollar coins = 3 : 2 : 1. If the total value of the coins is Dollar 240 only, find the number of 1 dollar coins.
Explanation:
Value = No. of coins × denomination in the amount for the type of coin.
Thus, combined ratio of value is 5 × 3 : 2 × 2 : 1 × 1 = 15 : 4 : 1 Then Rs. 1 coin is 1/20 × 240 = Rs. 12 i.e. 12 coins
Hence, option (b).
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