Scott Woodbury-Stewart

GMAT OFFICIAL GUIDE PS – When n liters of fuel was added to a tank that was already 1/3 full…

When n liters of fuel was added to a tank that was already 1/3 full…

Solution:

We can let c = the capacity of the tank. Since when n liters of fuel was added to a tank that was already 1/3 full, the tank was filled to 7/9 of its capacity, we can say:

n + (1/3)c =(7/9)c

Multiplying the equation by 9 we have:

9n + 3c = 7c

9n = 4c

c = (9/4)n

Answer: D

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