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    Dawn lives 18k’ away from work. She drives to work and back 5 days a week. Her cars fuel consumption is 28mpg (miles per gallon) and petrol costs £1.39 per litre. Calculate the weekly cost of petrol for Dawn travelling to and from work.

    I’m finding this question confusing on which conversions I need to use. Help would be very appreciated.
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    (Original post by Grimey833)
    Dawn lives 18k’ away from work. She drives to work and back 5 days a week. Her cars fuel consumption is 28mpg (miles per gallon) and petrol costs £1.39 per litre. Calculate the weekly cost of petrol for Dawn travelling to and from work.

    I’m finding this question confusing on which conversions I need to use. Help would be very appreciated.
    (I assume it's 18km)
    First convert the miles per gallon to kilometers per gallon, then find out how many gallons they use up by dividing.

    Once you have the number of gallons, convert liters to gallons giving you the cost per gallon.

    times the two and it should be your answer.
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    Thank you! I’ve now realised where I went wrong.
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