A car uses 7 litres of petrol per 100 km. How much petrol will it use on a trip of 450 km?
Answer and explanation
Correct answer: C. 31,5 litres
- Step 1: The trip is 450/100 = 4,5 units of 100 km.
- Step 2: Petrol = 4,5 × 7 = 31,5 litres.
Answer
31,5 litres.
Why not the others: 3150 litres: the 'per 100 km' was ignored. 64,28571428571429 litres: the distance was divided by the consumption. 315 litres: the conversion used 10 instead of 100.
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