Question 134

9 men went a hotel. 8 of them spent Rs.30 each over their meals and the 9th spent Rs. 20 more than the average expenditure of all the nine. The total money spent by them is:

Solution

Let the ninth person's expenses be x rupees.

Total expense by the group = x + 240

Average = (x+ 240)/9

But the average is 20 less than x

(x+240)/9 + 20 = x

x + 240 + 180 = 9x

8x = 420

x = 52.5

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