SOLUTION: Mr Smith's car uses 1 litre of fuel to travel 12km.How much fuel will be needed to travel 420km?

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Question 1022961: Mr Smith's car uses 1 litre of fuel to travel 12km.How much fuel will be needed to travel 420km?
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
1 litre of fuel to travel 12km
%281+l%29%2F%2812+km%29
Multiply numerator and denominator by 1/12
%28%281%2F12%29%2Al%29%2F%281+km%29= (1/12) litres per km
The fuel required for 420 km = (1/12)*420 litres
= 420/12 = 35 litres