Question

Subtract. Susan began a trip with 18 1/2 gallons of gas in the gas tank of her car. If she used 17 3/4 gallons on the trip, how many gallons did she have left when she finished the trip?

a 1 1/4 gallons
b 1 3/4 gallons
c 1/2 gallons
d 3/4 gallons

Answer 1

D. 18.5 minus 17.75 is .75

Answer 2

Option (d)
`(3)/(4)` gallon is correct.

Explanation:

Amount of gas present in the gas tank when she began the trip is
`18(1)/(2) =(37)/(2)` gallons.

Amount of gas she used in the trip is
`17(3)/(4) =(71)/(4)` gallons

Now, in order to find the amount gas she has left when she finished the trip, we need to subtract the amount of gas used during the trip from the gas present in the gas tank at the begining.

So, the amount of gas she have left is
`(37)/(2) -(71)/(4)`

`=(74-71)/(4)`

`=(3)/(4)`

Hence, she left with
`(3)/(4)` gallon of gas.

So, option D is correct.