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Sandy had one hundred fifty-five dollars to spend on eight books. After buying them she had eleven dollars.How much did each book cost?

1 Answer

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$18

1) Gathering the data

Sandy: $155 on 8 books

Change: $11

2) Let's write an equation for that since we don't know how much each book cost.

155 -8x = 11 Note that we're calling books by x, and the number of it: 8

155 -8x =11 Subtract 155 from both sides

-8x = 11 -155

-8x = -144 Divide both sides by -1

8x = 144 Divide both sides by 8

x = 18

3) Hence, each book costs $18

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