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Mathematics 7 Online
OpenStudy (anonymous):

What is a petrol consumption of 40 miles per gallon in litres per 100 kilometres? (1mile=1.61km, 1 gallon = 4.55 litres)

OpenStudy (campbell_st):

startby doing the conversion 40 x 1.61 km per 4.55 litres then divide by 4.55 to get km per litre

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