Math-Logic

[quote="Guest"]There is a fish tank which contains 50 gallons. But every week 2.5 gallons evaporate from the tank. The owner of the fish tank adds 3 gallons every 10 days.Today after owner added 3 gallons, there are 44 gallons of water in the tank.

How much gallons water will be in the tank after owner adds 3 gallons 70 days from today.

It is best just to think of evatoration and added water seperately and put all the numbers together at the end.
So it will be 44 + added water - evaporation.

Now it is your turn to think about it.