Last Updated on May 11, 2023
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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