SOLUTION: I have been struggling with this problem for a while now and I was wondering if anyone could help me? I would deeply appreciate it!!! Please and Thank You!!!

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Question 125529This question is from textbook Algebra Structure and Method
: I have been struggling with this problem for a while now and I was wondering if anyone could help me? I would deeply appreciate it!!! Please and Thank You!!!

Solving Problems Involving Inequalities
solve.
At least how many grams of copper must be alloyed with 387g of pure silver to produce an alloy that is no more than 90% pure silver?
This question is from textbook Algebra Structure and Method

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let c = grams of copper to be added
(grams of silver) / (grams of copper and silver) < = .90
387+%2F+%28c+%2B+387%29+%3C=+.9
387+%3C=+.9%28c+%2B+387%29
387+%3C=+.9c+%2B+348.3
.9c+%3E=+387+-+348.3
.9c+%3E=+38.7
c+%3E=+43g
At least 43 grams of copper must be added
check:
387+%2F+%28c+%2B+387%29+%3C=+.9
387+%2F+%2843+%2B+387%29+%3C=+.9
387+%2F+430+%3C=+.9
.9+%3C=+.9
OK