These are the types where you are asked to create a special mixture of two substances of different value. 2007InvA06

Step one, make your equations.

Total weight = 20.  Total value = 20\times1=20

x+y=20

.75x+1.25y=20

simlt(1,1,20,.75,1.25,20)

x=10 y=10

2006State45

 

simlt(1,1,100,5,10,700)

60