Car A had 7800 ml of petrol. Car B had 10.3 ℓ of petrol. When the same amount of petrol was used in each car, the amount of petrol left in Car B was six times of that left in Car A. How much petrol was used in each car? Leave your answer in litres.
7800 / 1000 ==7.8 Liters in Car A
Let the amount of petrol used by each cars==P
10.3 - P ==6 * [7.8 - P], solve for P
10.3 - P ==46.8 - 6P
- P + 6P ==46.8 - 10.3
5P == 36.5
P == 36.5 / 5
P ==7.3 Liters of petrol used by each car.
