Volume of container

Question

There were two tanks, tank A and tank B. Tank A measured 12 inches by 10 inches, by 20 inches. It was 2/3 filled with water. Half of the water was poured  into tank B, which was already 1/5 filled with water, filling it to the brim. What was the total capacity of the two tanks?

Answer 1

Volume of A = 2400 in³

(2/3) Volume A = 1600 in³

Half of that = 800 in³

800 in³ = (4/5)B

 

What is the volume of B?