SOLUTION: Robin has 21 books on computers. She donates z of them to the school library. How many does she have left?

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Question 748579: Robin has 21 books on computers. She donates z of them to the school library. How many does she have left?
Found 2 solutions by timvanswearingen, Cromlix:
Answer by timvanswearingen(106) About Me  (Show Source):
You can put this solution on YOUR website!
She started with 21 and got rid of, or subtracted z:
21-z

Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
(21 - z)would be the number of books left.