Question 48607
Let x=amount selling for $3 per lb
Then 80-x=amount selling for $4 per lb

Now we know that the total amount of dollars generated by selling the candy separately would have to equal the total amount of dollars generated by selling the 80 lb mixture.  Therefore, our equation to solve is:

$3x+(80-x)($4)=(80)($3.60) simplifying, we get:
3x+320-4x=288
-x=-32 or
x=32 lb of $3 candy
80-x=80-32=48 lb of $4 candy


Hope this helps -----ptaylor