Sagot :
Answer:
- 1 3/7 gallons
Step-by-step 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
let the amount of gas be x
[tex]\\ \sf\longmapsto x+2\dfrac{4}{7}=4[/tex]
[tex]\\ \sf\longmapsto x+\dfrac{18}{7}=4[/tex]
[tex]\\ \sf\longmapsto x=4-\dfrac{18}{7}[/tex]
[tex]\\ \sf\longmapsto x=\dfrac{28-18}{7}[/tex]
[tex]\\ \sf\longmapsto x=\dfrac{10}{7}[/tex]
[tex]\\ \sf\longmapsto x=1\dfrac{3}{7}[/tex]