Explanation:
The Hint said to find the two things in comparison
they are:
- 99km----------→9lit
- Xkm----------→12lit
cross multiply the two equations
=99km*12lit=9lit*Xkm
=1188lit/km=9Xlit
note;
liters will annul liters
hence,
X=1188km/9
X = 132km
is the final answer