Six girls went to a restaurant for taking their meals. Five of them spent Rs. 10 each on their meals and the sixth spent Rs. 10 more than the average expenditure of all the six. What was the total money spent by them?

66

78

84

72

Solution: Assume the average expenditure of all the six be Rs. x. Then, 10*5 + (x+10) = 6x ==> x=12. .'. Total money spent = 6x = Rs. (6*12) = Rs. 72.

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