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Set up an equivalent ratio: 9/750g=x/1500g (where 1.5 kg has been coverted into grams) Then solve, x=9*1500/750 x=18 Another approach is to observe that 1.5 kg is 2 times as much as 750g. Therefore the cost would also be twice as much so 2*9 = 18.

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16y ago

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