WAEC Mathematics 2010 Paper

Concept:Use unitary method to find the litres of petrol bought with N900.00, then convert litres to distance.Explanation:Cost of 1 litre of petrol is N63.00.With N900.00, the number of litres bought is:$$\text{litres} = \frac{900}{63} = \frac{100}{7} \text{ litres}$$The car covers 14 km using 1 litre of petrol.So the distance covered by $\frac{100}{7}$ litres is:$$\text{Distance} = \frac{100}{7} \times 14 = 200 \text{ km}$$Therefore, the car can go 200 km with N900.00 worth of petrol.Answer:D. 200km