After repairing my water tank, I am going to refill it. Every hour is gains 3 gallons of water. How long will it take to fill my 90 gallon tank?

Question

After repairing my water tank, I am going to refill it. Every hour is gains 3 gallons of water. How long will it take to fill my 90 gallon tank?

Answer 1

If every hour is 3 gallons, and you need 90 gallons, then how many hours does it take? 

 

Compare this to another example. If you make $10/hour as a babysitter, and you want to make $50 to buy a new dress, how many hours do you have to work? 5 hours, because $10*5=$50.

 

So, 3 gallons times how many hours = 90?

Or in otherwords, what is 90 divided by 3?

 

30.