Question 33244
Let x be the solution:
Equation:
1.2x+1.8(20-x)=1.68(20)
1.2x-1.8x+36=33.6
-2.4=-0.6x
x=4
20-4=16
Hence, for 1.2$ there is needed to be 4lb of mixture added, and for 1.8$ there is needed to be 16lb of mixture added.
Paul.