Hi,

A grocer wants to make a 10-pound mixture of cashews and peanuts that he can sell for $3.29 per pound. 

 If cashews cost $5.60 per pound and peanuts cost $2.30 per pound, how many pounds of each must he mix?

Let  represent the number of pounds of cashews

 and the number of pounds of peanuts

Question states***

 $5.6n + $2.3(10-n) = $3.59/lb*(10lb) ***

 5.6n + 23 - 2.3n = 32.9

 3.3n = 9.9

 n = 3, the number of pounds of cashews

and 10-n = 7, the number of pounds of peanuts

CHECKING our answer***

 $16.80 + $16.10 = $32.90 

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