Let x gallon regular gas and y gallon premium gas were sold

x+y = 240 -------------(1)

2.25x+3.05y = 612 -----------(2)

multiplying 1 with 2.25 we get

2.25x+2.25y =540 ------------(A)

Subtracting A from 2 we get

0.8y = 72 hence y = 90 gallon

therefore x = 150 gallon

Answer

Regular gas : 150 gallon

Premium gas : 90 gallon

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