SOLUTION: How many tin and how much lead must be added to 700 pounds of an alloy containing 50% tin and 25% lead to make an alloy which is 60% tin and 20% lead?

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Question 911799: How many tin and how much lead must be added to 700 pounds of an alloy containing 50% tin and 25% lead to make an alloy which is 60% tin and 20% lead?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x, pounds of tin to add
y, pounds of lead to add

Account for tin:
%28700%2A50%2B100%2Ax%29%2F%28700%2Bx%2By%29=60

Account for lead:
%28700%2A25%2B100y%29%2F%28700%2Bx%2By%29=20

Solve the system of equations for x and y.