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A gas station sells regular gas for $2.20 per gallon and premium gas for $2.90 a gallon. At the end of a business day 240 gallons of gas had been sold, and receipts totaled $591. How many gallons of each type of gas had been sold?

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Answer:

A possible combination of the gas purchases is 90 gallons of premium gas, and 150 gallons of regular gas.

Step-by-step explanation:

591=2.2x+2.9y

x+y=240

y=240-x

591=2.2x+2.9(240-x)

591=-.7x+696

.7x=105

x=150

150+y=240

y=90

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