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# $\textbf{\textcolor{#4257b2}{Mixed Review}}$There were $407$ books in the school library. The ninth grade returned $23$ books and checked out $17$; the tenth grade returned $15$ books and checked out $29$; the twelfth grade checked out $26$ books and returned $30$. How many books were left in the library?

Solution

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Step 1
1 of 4

The goal of this exercise is to find out how many books were left in library.

We will do that by subtracting number of checked out books and by adding number of returned books.

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