SOLUTION: How many pounds of peanuts that sell for $3/lb must be mixed with 3 pounds of cashews that sell for $7/lb to produce a mixture that sells for $4/lb?

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Question 263449: How many pounds of peanuts that sell for $3/lb must be mixed with 3 pounds of cashews that sell for $7/lb to produce a mixture that sells for $4/lb?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
3p+3*7=4(p+3)
3p+21=4p+12
9=p
9 lbs of peanuts to mix with 7 pounds of cashews