so, the elephant drank (2560-1944=614) 616 liters of water in two weeks. How many is that per day?
we divide: 616/14=44!
so the elephant drinks 44 liters of water per day.
now, how many full days are there in a tank of 2560 liters?
we have to divide again:
2560/44= 58 and 8/44 left.
but 8/44 is not enough for a day, and the question only asks for full days: so we can answer: 58!