SOLUTION: When Walter drove up to the gasoline pump, he noticed that his gasoline tank was 1/8 full. He purchased 7.5 gallons of gasoline for $10. With this additional gasoline, his gasolin

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Question 284718: When Walter drove up to the gasoline pump, he noticed that his gasoline
tank was 1/8 full. He purchased 7.5 gallons of gasoline for $10. With this additional gasoline, his gasoline tank was then 5/8 full. The number of gallons of gasoline his tank holds when it is full is
(A) 8.75 (B) 10 (C) 11.5 (D) 15 (E) 22.5
Found 2 solutions by richwmiller, mananth:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1x/8+7.5=5x/8
7.5=4x/8=x/2
15=x
(D)

Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
the tank was 1/8 full
he put 7.5 gallons of gasoline so it became 5/8 full
the difference after filling and before filling
= 5/8 -1/8
= 4/8 =1/2
1/2 tank =7.5 gallons
1 tank = 15 gallons