Answer:
14.25 liters per 150 km.
Step-by-step explanation:
Since 150 is half-again 100 (that is, it's one-and-a-half times the 100), you'll need the same ratio of increase in the amount of fuel, so 9.5 + another 1/2 of 9.5. Half of 9.5 = 4.75. Add that to the original 9.5 and you get 14.25 liters per 150 km.
