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How many litres of sugar solution should be added to a 17%sugar solution to obtain 72 litres of 25%sugar solution
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How many litres of sugar solution should be added to a 17%sugar soluti...
So first,
35(x) + .17(72-x) = .25(72)
by multiplication (distribution property of real numbers) ,
we will get,
(35x) + (12.24-.17x) = 18
18x + 12.24 =18
18x=18-12.24
18x= 5.76 
so x= 32 
35% sugar solution needs 32 liters and 17% sugar solution needs 40 % in order to obtain 25% sugar solution in 72 liters.

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How many litres of sugar solution should be added to a 17%sugar solution to obtain 72 litres of 25%sugar solution
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