Question 21907
Let "C" be # of chocolate and "V" number of vanilla.
Inequalities:
    10C + 20V <= 600   (this is time in large oven)
 Graph C <= -2x+60
    40C + 30V <= 1200  (this is time in small over)
 Graph C<= (-3/4)V + 30
 Graph C>=6 and V>= 12
Graphing these will determine your solution region.
Determine the vertices of this region.
The object function is as follows:
  Profit = 50C + 60V
Substitute the individual vertex values
to determine the number of C's and V's
that will give you a maximum profit.

Cheers
stan H.