A pile of logs has 28 logs in the bottom layer 27 in the sec

A pile of logs has 28 logs in the bottom layer, 27 in the second layer, 26 in the third, and so on. The top layer contains 9 logs. Find the total number of logs in the pile.

Solution

total number of piles =(bootom t o top)

total no of piles =28+27+26+25+24+23+22+21+20+19+18+17+16+15+14+13+12+11+10+9

=370