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A car uses one litre of petrol for every 14km I... - WAEC Mathematics 2010 Question

A car uses one litre of petrol for every 14km. If one of petrol cost N63.00, how far can the car go with N900.00 worth of petrol?
A
420km
B
405km
C
210km
D
200km
correct option: d

1 litre = N63.00

xlitres = N900.00

x x N63 = N900 x 1 litre

x = (\frac{900}{63} \times litre)

x = (\frac{100}{7}) litres

Also, 1 litre = 14km

(\frac{100}{7}) = y

y x 1 litre = (\frac{100litre}{7}) x 14km

y = 20km

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