Jodie buys 12 cans of cola. There are 330 ml of cola in each can. Rob buys 4 bottles of cola. There is 1 litre of cola in each bottle. Rob buys more cola than Jodie. How much more?

Again, I would highlight the important points of the question.

1. Jodie buys 12 cans which are 330ml in each can.

2. Rob buys 4 bottles which are 1 litre each.

From 1), we can figure out how many ml Jodie bought. 12 x 330 = 10 x 330 + 2 x 330 = 3300 + 660 = 3960ml

From 2) we can figure out how many litres Rob bought. 4 x 1 = 4 litres. 

However, to compare we would want both to be in litres or both to be in ml. We know that in 1 litre, there's 1000ml. 

So if I convert Rob's 4 litres into ml, I would get 4 x 1000 = 4000ml. 

Then to find out how much more Rob has than Jodie, I would subtract 4000 from 3960.

4000 - 3960 = 40ml.

If you decided to convert Jodie's 3960ml to litres, you would have to divide 3960 by 1000.

3960/1000 = 3.960.

Then you would take away. 4 - 3.960 = 0.04 litres which is also equal to 40ml.

Therefore, the answer is 40ml or 0.04 litres.