Question

Carlos gas tank is 1/10 full. After he buys 11 gallons of gas, it is 3/5 full. How many gallons can carlos tank hold?

Answer 1

Current amount of gas:
`(1)/(10) t`

After adding 11 gallons:
`(1)/(10) t` + 11 =
`(3)/(5) t`

11 =
`(3)/(5) t` -
`(1)/(10) t`

11 =
`(6)/(10) t` -
`(1)/(10) t`

11 =
`(5)/(10) t`

11 =
`(1)/(2) t`

22 = t

Answer: 22 gallons