Question 987702
How many pounds of candy worth $8 per lb should be mixed with 100 lb of candy
worth $4 per lb to get a mixture that can be sold for $7 per lb?
<pre>
Let the number of lbs of the pricer candy we must add be x

Type       Number     Price    Value
 of          of       per        of
candy       lbs        lb      candy
-------------------------------------------
pricier      x         $8       $8x
cheaper    100         $4       $4(100)
-------------------------------------------
TOTALS    100+x        $7      $7(100+x)

 The equation comes from the column on the right

  {{{(matrix(4,1,Value,of,pricier,candy))}}}{{{""+""}}}{{{(matrix(4,1,Value,of,cheaper,candy))}}}{{{""=""}}}{{{(matrix(5,1,Total,value,of,ALL,candy))}}}

8x + 4(100) = 7(100+x)

Now you can finish.

Edwin</pre>