5gallons cost $25 how much would 30 quarts will cost

30 quarts costs $37.50

Step-by-step explanation:

We can use proportions to solve this problem.  Put the cost over the size.  The trick of this problem is the units in the denominator have to be the same

Lets change gallons to quarts.

1 gallon = 4 quarts

5 gallons * 4 quarts/1 gallon = 20 quarts

$25               x dollars

    =

20 quarts       30 quarts

Using cross products

25*30 = 20x

Divide by 20

25*30/20 = 20/x

37.5 = x

30 quarts costs $37.50

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