Question

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

Answer 1

7.5 gallons is 30 quarts and if the price is 5$ per gallon then the cost for 30 quarts would cost $37.50

Answer 2

30 quarts costs $37.50

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