The cost of gasoline varies directly with the number of gallons bought. If 5 gallons of gasoline cost $18.00, find the cost of 20 gallons.

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Mathematics

Kiki

14 June, 02:07

The cost of gasoline varies directly with the number of gallons bought. If 5 gallons of gasoline cost $18.00, find the cost of 20 gallons.

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Cullen Patterson · Answer 1

You would divide 18 by 5 to find the unit rate which is cost per gallon. 18/5=3.60$ So gas is 3.60$ per gallon (unit rate). So to find the cost of 20 gallons you would multiply 3.60 by 20 which equals 72$. So 20 gallons of gas costs $72.