Question
In one box, three different types of old coins are in
the ratio of 3: 5: 7, the value of old coins is Rs. 1, 5 and 10 rupees respectively. If the total value of coins in the box is Rs 294, then tell the number of old coins of Rs 10.Solution
Let the number of coins of Rs. 1, 5, and 10 rupees be 3x, 5x, and 7x respectively Total value of coins = (3x x 1) + (5x x 5) + (7x x 10) 3x + 25x + 70x = 98x  98x = 294 x = 294/98 = 3 Total value of coins of Rs. 10 = 3 x 70 = Rs. 210 Total number of coins = 210/10 = 21
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