Which bottle size?

This task is about working out the best price.

Question 1Change answer

range of different sized cola bottles
a)  How many bottles of each size would Alex have to buy if he needed 6 litres of cola, and how much would it cost?
 
 
Number needed for 6 L
Total Cost
  2 L $ 
  1.5 L $ 
  1 L $ 
  750 mL (0.75 L) $ 
 
b)  Alex decided he needed 12 litres of cola.
     Which size cola bottle would be the cheapest to buy?