Question

an aquarium tank holds 570 liters of water how much is this in gallons use the following conversions 1 gallon is 3.8 liters

Answer 1

150 gallons 

there my friend
easy division

Answer 2

So knowing that the tank holds 570 liters of water, we would divide the amount of liters per gallon which is 3.8. 
570 / 3.8 = 150 gallons of water.
I hope this helps :)