When \(n\) liters of fuel were added to a tank that was already \(\dfrac13\) full, the tank was filled to \(\dfrac79\)

[Vincen]

When \(n\) liters of fuel were added to a tank that was already \(\dfrac13\) full, the tank was filled to \(\dfrac79\) of its capacity. In terms of \(n,\) what is the capacity of the tank, in liters?

A. \(\dfrac{10}9 n\)

B. \(\dfrac43 n\)

C. \(\dfrac32 n\)

D. \(\dfrac94 n\)

E. \(\dfrac73 n\)

Answer: D

Source: Official Guide