SOLUTION: A mixture worth 3.50 per pound is to be made by combining 20 pounds of peanuts work 3.00 per pound with raisins worth 5.00 per pound, How many raisins should be used?

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Question 1080213: A mixture worth 3.50 per pound is to be made by combining 20 pounds of peanuts work 3.00 per pound with raisins worth 5.00 per pound, How many raisins should be used?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
r, pounds of raisins

%285r%2B3%2A20%29%2F%28r%2B20%29=3.5

5r%2B60=3.5%28r%2B20%29

continue,
and
solve for r.