At a pet store, it costs $5 to wash a cat and $7.50 to wash a dog. Last week the store made $60 from washing cats and dogs. If 6 cats were washed, write and solve a linear equation to find how many dogs were washed.

Question

Lilian West

Mathematics

23 November, 10:50

At a pet store, it costs $5 to wash a cat and $7.50 to wash a dog. Last week the store made $60 from washing cats and dogs. If 6 cats were washed, write and solve a linear equation to find how many dogs were washed.

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Answers (1)

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Whitney Acevedo · Answer 1

If you let x equal the number of cats washed and y equal the number of dogs washed then you can make the equation:

5x+7.5y=60

You can then put the number of cats washed into the equation:

5 (6) + 7.5y=60

30+7.5y=60

7.5y=30

y=4

So 4 dogs were washed