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23 January, 11:54

If a car uses 1/3 of a tank of petrol on the first part of the journey then 2/5 of a tank of petrol on the second part on the journey and has 8 litres how many litres of petrol did it have before the journey

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  1. 23 January, 15:34
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    We assume the petrol tank was full at the beginning of the journey.

    The petrol tank holds x litres.

    x - 1/3 x - 2/5 x = 8

    15x/15 - 5x/15 - 6x/15 = 8

    4x/15 = 8

    4x = 120

    x = 30

    The petrol tank holds 30 litres.
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