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The cost of petrol is irrelevant to the number of litres in a gallon which is approximately 4.5. Therefore the cost of a gallon of petrol at 90p per litre is £3.60. Furthermore if petrol costs 90p per litre you should fill the tank and a couple of jerry cans, not just buy a litre!

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14y ago
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Q: If petrol costs 90p a liter how many liters would i need to make a gallon?
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