SOLUTION: One bar of tin alloy is 25% pure tin and another bar is 10% pure tin. How many pounds of each alloy must be used to make 75 pounds of a new alloy which is 20% pure tin?
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Question 1010738: One bar of tin alloy is 25% pure tin and another bar is 10% pure tin. How many pounds of each alloy must be used to make 75 pounds of a new alloy which is 20% pure tin? Answer by fractalier(6550) (Show Source):
You can put this solution on YOUR website! Call x the amount of 25% alloy used.
Then 75-x is the amount of 10% used.
The set up looks like this:
.25x + .10(75-x) = .20(75)
.25x + 7.5 - .10x = 15
.15x = 7.5
x = 50 pounds of 25%
75-x = 25 pounds of 10%
