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ololo11 [35]
3 years ago
10

Dan has 20 books in his library. He bought several books at a yard sale over the weekend. He now has 71 books in his library. Ho

w many books did he buy at the yard sale?
Mathematics
2 answers:
jasenka [17]3 years ago
7 0
Hi !! 

He bought 51 books at the yard sale .

71 - 20 = 51


cheers !

Doss [256]3 years ago
4 0
To find the number of books he bought we need to do this:

 # of books bought at yard sale = # of books after yard sale - # of books before yard sale 

# of books bought at yard sale: x (we don't know what is yet)
# of books after yard sale: 71 books
# of books before yard sale: 20 books

Now set up the equation to solve: x = 71 - 20

Solve the equation: 
71 - 20 = 51
so x = 51

Dan bought 51 books at the yard sale.


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