Question

Can someone help me to answer this please.

Answer 1

All it's asking is:  How many cubic inches are there in 22 gallons ? And it already GAVE us the conversion factor !

The conversion factor is . . . . .  1 gallon = 231 cubic inches

Multiply each side by 22:  22 gallons = 22 x (231 cubic inches)

22 x 231 = 5,082

22 gallons = 5,082 cubic inches

If you empty a full 22-gallon tank out through that flow meter, the meter  will register 5,082 cubic inches when the tank is empty.