Math help please!?

Question

Twelve gallons of regular unleaded gasoline plus 8 gallons of premium unleaded gasoline cost $78.48. Premium unleaded gasoline costa $0.11 more per gallon than rwgular unleaded. Find the price per gallon for each grade of gasoline.

Answer 1

12g + 8(g + .11) = $78.48       12g + 8g + .88 = $78.48        20g +.88 = $78.48    Subtract .88 from both sides.

 

20g = $77.60    Divide both sides by 20.   g = $3.88 regular         g + .11 = $3.99 premium