Question

23 A racing car used 255 litres of fuel to complete a 340 km race. On average, how many litres of fuel did the car use every 100 km?

Answer 1

So the purpose of the question is to find how many liters of fuel per 100km.

There are 2 ways

Either by cross multiplication or by directly calculating it

• By cross multiplication:
340km -----> 255 liters
100km -----> x liters

So 340x = 100(255)
x= 25500/340
x= 75 liters is the amount of liters of fuel used by the car every 100km.

• By directly calculating it:
Basically since it's every 100km, you're similarly finding the percentage, so:
(255 liters/ 340km) x 100km = 0.75 x 100 = 75 liters is the amount used by the car every 100km.

Answer 2

255 litres for 340 km
for 1 km = 255/340 litres
for 100 km = 255/340 * 100 = 75 litres