# At the pumps

## Problem

People in England buy their petrol in litres but often talk about the previous measure of gallons.

Can you find out how many litres there are in one gallon?

When you've found out, let's suppose that I have to pay £1.00 for each litre.

I want to fill my 12 gallon petrol tank. How much will it cost me?

## Getting Started

How would you work out how much one gallon of petrol costs?

Can you use this to work out how much the full tank costs?

## Student Solutions

We had about 40 correct answers for this problem. Some of which are set out below. Beth used her good method for finding 12 times by breaking it down - well done! Shannon set it out all very logically to get the correct answer. Dana and one or two others said how they'd used the internet to find information. Ben's answer was different because a gallon measure is different in USA. I included Joe's as it is the first I've seen coming from the islands off Scotland. Finally, Abidine showed how to use many places of decimals and come up with a correct answer.

Well done all of you!

Beth

I found out that there was 4.5 litres in a gallon.

Say one litre cost £1.00,

How much would it cost if you needed to fill a 12 gallon petrol tank?

So one gallon costs £4.50p, two gallons cost £9.00, three gallons cost £13.50p, six gallons would cost £27.00, twelve gallons would cost a whopping £54.00.

So that's your answer!

Easy peasy lemon squeesy

Shannon

First I found out how many litres in a gallon and I came up with 4.55 litres.

Then I multiplied 4.55l by 12 to see how many litres were in 12 gallons and I got the answer of 54.60 litres.

Then I multiplied 54.60 litres by £1 and got the answer of £54.60

Dana

First I went on google and typed in how many liters are in 1 gallon and my answer from that was 4.5

So I added that 12 times and my answer from that was 54.0 so we put that in a money way and it was £54.00

Ben

1 gallon = 3.785 litres

12 gallons = (3.785 x 12) litres

(3.785 x 12) = 45.42

12 gallons = 45.42 litres

1 litre = £1

therefore 12 gallons cost £45.42

Joe

First of all I found out how many litres there are in a gallon > 4.55 then multiplied that by 10 > £45.50 then multiplied by 2 > 9.10

Abidine

Well, I found out that 1 gallon contains 4.54609188 litres.