45 dollars
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Let x = third pile First Pile = 2x + 10 Second Pile = 2x Third Pile = x (2x+10) + (2x) + (x) = 3000 2x + x + 2x + 10 = 3000 5x + 10 = 3000 5x = 3000 - 10 5x = 2990 x = 2990/5 x = 598 Therefore there are 598 books in the third pile. I'm sure you can figure out how to get how many books are in all other piles.
1000
3000 dollars
One third of 9000 is calculated by dividing 9000 by 3. This division results in 300, which is one third of 9000. Mathematically, this can be represented as 9000 ÷ 3 = 300.
The answer depends on your local water company.