SOLUTION: How many pounds of 70% Columbian coffee must be added to ten pounds of 90% Columbian coffee to have p% Columbian coffee?

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Question 103295: How many pounds of 70% Columbian coffee must be added to ten pounds of 90% Columbian coffee to have p% Columbian coffee?
Answer by HyperBrain(694) About Me  (Show Source):
You can put this solution on YOUR website!
Let x= the amt. of 70% columbian coffee that MUST be added

10%2A90%2B70x=p%2A%28x%2B10%29
900%2B70x=px%2B10p
%2870-p%29x=10p-900
x=10p-900%2F%2870-p%29

Therefore, 10p-900%2F%2870-p%29 pounds must be added