A money bag contains one rupee, 5 rupee and 10 rupee coins in the ratio of 3 : 5 : 7 respectively. If the total amount in the bag is Rs 980, then find the number of coins of Rs 10.

Options
a) 68
b) 69
c) 71
d) 70

Solution

As per question
Money bag contains = 1 Rs. : 5 Rs. : 10 Rs.
Coins in the ratio = 3 : 5 : 7 = 980
3 x 1 Rs. + 5 x 5 Rs. + 7 x 10 Rs.= 980
3x+ 25x+ 70x = 980
98x = 980
x = 10
Number of coins of 1,5 and 10 are 3 x 10 (30), 5 x 10(50), 7 x 10(70) respectively.

Ans: number of coins of Rs 10 are 70