A bag contains 50 paise, 1 rupee and 2 rupee coins in the ratio 2:5:8. If the total amount is Rs. 352, find the total number of coins in the bag.
Correct answer: D. 240
- A. 160
- B. 200
- C. 250
- D. 240
Explanation
Let the numbers of 50-paise, 1-rupee and 2-rupee coins be 2k, 5k and 8k. Their value is Rs. (0.50 × 2k) + (1 × 5k) + (2 × 8k) = Rs. 22k, so 22k = Rs. 352 gives k = 16 and the total number of coins is 2k + 5k + 8k = 15k = 240 coins. The likely mistake is option b, 200 coins, from adding the ratio parts without first using the different values of the coins.
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