SOLUTION: How many bags of 5% concrete should be mixed with 7 bags of 23% concrete to get a mix of 12% concrete?

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Question 325046: How many bags of 5% concrete should be mixed with 7 bags of 23% concrete to get a mix of 12% concrete?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
Let b = bags of concrete
0.05b + 7(0.23) = 0.12(b + 7)
Can you take it from here?