Toms gas tank is 1/5 full. After he buys 6 gallons of gas, it is 7/10 full. How many gallons can Toms tank hold?

If Tom's gas tank is 1/5 full, then after he bought 6 gallons of gas it's now 7/10 full, his gas tank can hold 12 gallons of gas.

Monday, August 20 2012