5Kg. of sugar at 60p.per Kg. and 7Kg. of sugar at 72 p. per Kg. were mixed together What will be the gain or loss by selling the mixed sugar at 66p. per Kg.
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Cost price of sugar = (100/120)×72=60
Let x and y be the two type of sugar
So we have
55x+ 62y = 60(x+y)
5x=2y
x/y = 2/5
So 2:5 ratio must be added to make the mixture
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