The total fuel quantity in the two supply tanks will always be what quantity until the fuel in the main tanks is exhausted?

The total fuel quantity in the two supply tanks will always be what quantity until the fuel in the main tanks is exhausted?

• A. 222
• B. 104
• C. 1530
• D. 118

Answer: (A)

The two supply tanks form a buffer whose total amount stays fixed as long as the main tanks still have fuel. Fuel may move between the main tanks and the supply tanks to meet demand, but the combined quantity in the two supply tanks doesn’t change until the main tanks are emptied. So the total stored in those two tanks remains the value it has at that moment, which is 222 units in this scenario. Only when the main tanks run dry can that constant be broken and the total in the supply tanks begin to drop.

The two supply tanks form a buffer whose total amount stays fixed as long as the main tanks still have fuel. Fuel may move between the main tanks and the supply tanks to meet demand, but the combined quantity in the two supply tanks doesn’t change until the main tanks are emptied. So the total stored in those two tanks remains the value it has at that moment, which is 222 units in this scenario. Only when the main tanks run dry can that constant be broken and the total in the supply tanks begin to drop.