SOLUTION: a certain alloy contails 75% copper and a second alloy 35% copper. how many kilograms of the second alloy must be added to 62 kilograms of the first to form an alloy that is 50% co

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Question 335306: a certain alloy contails 75% copper and a second alloy 35% copper. how many kilograms of the second alloy must be added to 62 kilograms of the first to form an alloy that is 50% copper?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 35% alloy.
62%2875%29%2BA%2835%29=%2865%2BA%29%2850%29
4650%2B35A=3250%2B50A
15A=1400
A=280%2F3kg