A column in a bookshelf has $2$ yellow books and $3$ red books. If the bookshelf has $9$ such columns, how many books are there in the bookshelf?

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Solution

Number of books in a column $= 2 + 3 = 5$
Number of columns $= 9$

Number of books in $9$ columns $= 9 \times 5 = 45$ books

Hence, option C is correct.

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