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.