A 14.5 gallon gasoline tank is 3/4 full. How many gallons will it take to fill the tank?

Question

This math problem was on a text I failed and there are retakes I forgot how my teacher did it in class. Could u help me please?

Answer 1

If the tank is 3/4 full, then the number of gallons currently in the tank is 3/4 x 14.5 gallons = 10.875 gallons.  That leaves the difference to be added. And that difference is 14.5 gallons - 10.875 gallons = 3.625 gallons.  If you  round off it would be 3.63 gallons. 

 

Done a different way:  If the tank is 3/4 full, that leaves 1/4 that remains empty (because 3/4 + 1/4 = 1.0).  So, 1/4 x 14.5 gallons = 3.625 gallons.