Jose's gas tank is 3/10 full. After 6 gallons of gas it is 4/5 full. How many gallons can Jose's tank hold?

How do I set this up?

3 answers

4/5 - 3/10 = 8/10-3/10 = 5/10 = 1/2

so 6 gallons is half a tank :)
Thank you!
You are welcome.