Question

When Walter drove up to the gasoline pump, he noticed that his gasoline tank was $\dfrac18$ full. He purchased $7.5$ gallons of gasoline for $10. With this additional gasoline, his gasoline tank was then $\dfrac58$ full. The number of gallons of gasoline his tank holds when it is full is

$8.75$

$10$

$11.5$

$15$

$22.5$

Answer: D

Concepts:fraction ratio and proportion

Difficulty rating: 860

Solution:

The increase is $\dfrac58 - \dfrac18 = \dfrac12$ of a tank, which equals $7.5$ gallons.

So a full tank holds $2 \cdot 7.5 = 15$ gallons.

Thus, the correct answer is D .

1996 AMC 8 Problem 10

Answer: D

Difficulty rating: 860

Solution:

Problem 10 in Other Years