Question 179935
To solve this, we need to find the total amount of pounds of nuts (walnuts and pecans). We then need to find the total dollar amount that the walnuts and pecans cost. We then divide the total dollar amount by the total amount of pounds of nuts (walnuts and pecans). 


Let amount of pounds of walnuts be w. Then, the total dollar amount paid for the nuts (walnuts and pecans) = .84(w)  + 20(1.20)  =  .84w  +  24.


Since the amount of pounds of walnuts is w, then the total amount of pounds of nuts (walnuts and pecans) equals w  +  20.


We now get: 		  {{{(.84w + 24)/(w + 20) = 1.04}}}

.84w   +   24   =  1.04w  + 20.8
-.2w   =   -3.2
w   =    16


So, 16 lbs of walnuts, at .84c per lb would need to be mixed with 20 lbs of pecans, at $1.20 per lb in order to get a mixture that costs $1.04 per lb.