Question

Hen n liters of fuel were added to a tank that was already 1 3 full, the tank was filled to 7 9 of its capacity. In terms of n, what is the capacity of the tank, in liters?

Answer 1

Step-by-step explanation:

capacity of the tank is 9 liters;

So, there are already 3 liters (1/3*9=3) of fuel

and after adding n liters there are 7 liters (7/9*9=7) --> 3+n=7 --> n=4

capacity=9=n*9/4.