SOLUTION: A and B are alloys of silver and copper. An alloy that is 5 parts A and 3 parts B is 52% silver. One that is 5 parts A and 11 parts B is 42% silver. What is the percentages of silv

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Question 758413: A and B are alloys of silver and copper. An alloy that is 5 parts A and 3 parts B is 52% silver. One that is 5 parts A and 11 parts B is 42% silver. What is the percentages of silver in A and B?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Alloy A contains x percent silver
Allow B contains y percent silver

5 parts A and 3 parts B:
%285x%2B3y%29%2F%285%2B3%29=52
5x%2B3y=8%2A52
highlight%285x%2B3y=216%29

5 parts A and 11 parts B:
%285x%2B11y%29%2F%285%2B11%29=42
5x%2B11y=16%2A42
highlight%285x%2B11y=672%29

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