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You have one type of nut that sells for $5.60/lb and another type of nut that sells for$7.30/lb. You would like to have 6.8 lbs of a nut mixture that sells for \$5.70/lb. How much of each nut will you need to obtain the desired mixture?

You will need
lbs of the cheaper nut
and
lbs of the expensive nut.