Hi,

Re Reply: another way of thinking about it is: 

Cost/Liter = $1.40/2.5L =  $0.56 per Liter  &  6 will cost: 6(.56) = $3.36

2.5 litres of coke costs 1.40 how much will 6 litres cost? 

     |Cross Multiplying to solve

      2.5x = 6(1.40)

         x = 6(1.40)/2.5

  x = $3.36 

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