Question 1169512
at 0 minutes, the tank contains 50 liters.
at 20 minutes, the tank contains 40 liters.
at 50 minutes, the tank is 5% full.


if the tank is losing water at a constant rate, then it is losing the same amount of water each minute.


since it went from 50 liters to 40 liters in 20 minutes, it was losing 10 liters in 20 minutes.


losing 10 liters in 20 minutes at a constant rate means it is losing .5 liters per minute because 10 liters / 20 minutes = .5 liters per minute.


in another 30 minutes, at the constant rate of .5 liters per minute, it would lose an additional 15 liters.


the level would then be at 40 - 15 = 25 liters.


25 liters is 5% of the capacity of the tank, so the tank's capacity would have to be 25/.05 = 500 liters.