Write an equation and solve this problem, showing all your work in the box.

David has a collection of history books. Ken had 3 times as many books as David, but he sold 5 books to Dennis and 4 books to Steve. Now Ken has 18 books. How many history books does David have?

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1 Answer

David=x

Ken = 3x

3x-(5+4)=18

3x-9=18

3x = 27

x= 9
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