SOLUTION: A certain metal is 20% tin. How many kilograms of this metal must be mixed with 80 kilograms of a metal that is 70% tin to get a metal that is 50% tin?
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Question 640731: A certain metal is 20% tin. How many kilograms of this metal must be mixed with 80 kilograms of a metal that is 70% tin to get a metal that is 50% tin? Answer by sachi(548) (Show Source):
You can put this solution on YOUR website! let x kg of 20% mixed with 80 kg of 70% to get 50%
so x*20%+80*70%=(x+80)*50%
or 20x+5600=50x+4000
or 30x=1600
or x=1600/30=53.33 kg
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