SOLUTION: A certain metal has 40% tin. How many kilograms of this metal is to be mixed with 80 kilogram of metals with 70% tin in order to have a metal of 50% tin?

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Question 614386: A certain metal has 40% tin. How many kilograms of this metal is to be mixed with 80 kilogram of metals with 70% tin in order to have a metal of 50% tin?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(40%)x + (70%)80 = (50%)(80 + x)