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Five boxes of cookies cost nine dollars at this rate how much do 20 boxes cost?

1 Answer

3 votes

Answer:

$36

Explanation:

You want the cost of 20 boxes of cookies, given that 5 boxes cost $9.

Proportion

The cost is proportional to the number of boxes. Multiplying the number of boxes by 4 from 5 to 20 will multiply the cost by 4 from $9 to $36.

20 boxes will cost $36.

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User RSabet
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