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10 June, 15:08

Q5.

Gary's motorbike uses petrol.

Gary needs to mix oil with the petrol.

He mixes oil and petrol in the ratio 1:14 by volume.

Gary is going to ride his motorbike 3000 miles.

Each 20 miles he rides uses 1 litre of the oil and petrol mixture.

A 500 ml bottle of oil costs £3.99

Work out the total cost of the bottles of oil Gary needs to buy.

(1 litre = 1000 m)

You must show all your working.

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Answers (1)
  1. 10 June, 18:01
    0
    For every 20 miles he needs 1 liter of oil.

    You are told 1 liter = 1000 ml

    So for 1 liter of oil he needs to buy 2 bottles (500ml + 500ml = 1000 ml = 1 liter)

    The cost of 2 bottles is 3.99 + 3.99 = 7.98

    Now divide total miles by miles per liter, which the problem says 20 miles:

    3000 miles / 20 = 150

    He will need 150 liters of oil.

    Multiply the cost for 1 liter by number of liters needed:

    150 x 7.98 = £1,197
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