alleryA car uses 4 litres of petrol to travel 60 km. How far will it travel on 12 litres?
A120 km
B180 km
C150 km
D240 km
Answer & Solution
Correct answer: B. 180 km
1. Distance and petrol are in direct proportion: as one increases the other increases in the same ratio.
2. The petrol has gone from 4 litres to 12 litres, which is three times as much.
3. So the distance is three times as far.
4. That is 3 x 60 = 180 km.
5. Checking the ratio, 60 / 4 = 180 / 12 = 15 km per litre, which stays constant.
_Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.2 Direct Proportion_
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