SOLUTION: A 20 lb bag of nut mix has 40% of peanuts and 60% of cashews. To get 20% peanuts, how much of the mix should be replaced with pure cashews?

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Question 357298: A 20 lb bag of nut mix has 40% of peanuts and 60% of cashews. To get 20% peanuts,
how much of the mix should be replaced with pure cashews?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = #lbs that has to be taken and replaced. Then
0.40%2A20+-0.40x+%2B+0.00x+=+0.20%2A20,
8+-0.40x+=+4,
4+=+0.40x,
x+=+10. 10 lbs of the mix must be replaced with pure cashews.