Question

Caitlin has a $10 gift certificate to the music

store. She has chosen a number of CDs from the $7
bargain bin. If the cost of the CDs is $32 after the gift
certificate is credited, how many CDs did Caitlin buy

Answer 1

9514 1404 393

Answer:

6

Explanation:

Before application of the $10 credit, Caitlin's purchase was $32 +10 = $42. Your knowledge of multiplication facts tells you that 42 = 6×7. If each CD was $7, Caitlin bought 6 of them.

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If you need an equation, you could use ...

7x -10 = 32 . . . . the final value of Caitlin's purchase

7x = 42 . . . . . . . .add 10

x = 42/7 = 6 . . . . Caitlin bought 6 CDs.