Explanation:
so, the petrol (gasoline) consuming ratio for that car is
3 liters / 61 km = 3/61 liters/km.
to find the km driven after using 14 liters of petrol (gasoline) we need to find the factor f to turn 3 into 14. and then we need to multiply both sides of the ratio by this factor to keep the overall value of the ratio unchanged.
3 × f = 14
f = 14/3
3/61 × (14/3)/(14/3) = (3×14/3)/(61×14/3) =
= 14/(854/3) liters/km =
= 14/284.6666666... liters/km
it will use 14 liters for 284.6666666... km.
that is 284 ⅔ km.