Question

39.) Fiona bought a brand new Harley Davidson motorcycle. Since the weather was nice, she decided to go out for a ride with some of her friends. Before leaving town, she stopped to fill up her motorcycle with gas so that she had a full tank. If Fiona's motorcycle has a 4 gallon gas tank, and she only had to add 2 4/7 gallons, how much gas was in the tank before she filled up?​

Answer 1

let the amount of gas be x

`\\ \sf\longmapsto x+2(4)/(7)=4`

`\\ \sf\longmapsto x+(18)/(7)=4`

`\\ \sf\longmapsto x=4-(18)/(7)`

`\\ \sf\longmapsto x=(28-18)/(7)`

`\\ \sf\longmapsto x=(10)/(7)`

`\\ \sf\longmapsto x=1(3)/(7)`

Answer 2

• 1 3/7 gallons

Explanation:

Let the amount of gas in the tank before filling was x.

We have:

• x + 2 4/7 = 4
• x = 4 - 2 4/7
• x = 2 - 4/7
• x = 1 3/7 gallons