SOLUTION: A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 6% cement should he mix with 4 bags of 21% cement to produce a mix containing 9% cement?

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Question 729492: A contractor mixes concrete from bags of
pre-mix for small jobs. How many bags with
6% cement should he mix with 4 bags of 21%
cement to produce a mix containing 9%
cement?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Look at #729166. Your question was already answered.
http://www.algebra.com/algebra/homework/word/mixtures/Mixture_Word_Problems.faq.question.729166.html