3000 exercise books are arranged in 3 piles.the first pile has 10 more books than the second pile.the number of books in the second pile is twice the number of books in the third pile.how many books are in the third pile?

Answer 1

let x=pile one
x-10=second pile
x/2=third pile

x+(x-10)+(x/2)=3000
2x+x/2=3010
4x+x=6020
5x=6020
x=1204

The third pile is x/2, so the third pile has 1204/2, or 602 books.