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 price of coins kept in the box is 686, then tell the number of old coins of 10 rupees.Solution
Ratio of coins of Rs. 1, 5 and 10 rupees is = 3:5:7 Ratio of values of Rs. 1, 5 and 10 rupees is = 3x1:5×5:7 × 10 = 3:25:70 3+25+ 70 = 98 unit 98 unit = 686 1 unit = 686/98 = 7 Total value of coins of Rs. 10 = 7 x 70 = Rs. 490 Total number of coins = 490/10 = 49
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