The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 18 minutes requires 12.6 gallons of water. Find the amount of water used in a shower lasting 10 minutes.
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Since it is direct proportion, their ratios are equal.
18/12.6 = 10/x
you could use cancellation (numerator by numerator and denominator by denominator to simplify the solution)
18x = 126
x = 7 gallons
18/12.6 = 10/x
you could use cancellation (numerator by numerator and denominator by denominator to simplify the solution)
18x = 126
x = 7 gallons