arithmetic - in a batch of ten boys 9 boys spent rs 35 each for their meals the tenth one spent rs 18 more than the average expenditure of all the ten the total money spent by all of them was - skillgun

Let the average expenditure be Rs. x. Then,
10x = 9 x 35 + (x + 18) or 10x = x + 333 or 9x = 333 or x = 37.
Total money spent = 10x = Rs. (10 x 37) = Rs. 370.