Quote Originally Posted by VWGirl
so with keevo's help... you should have

.25x+1y+.50z= 10700
.35x+1.50y+.50z=15820
x+y+z=12000

right?
u can use a calculator and do it with matrix or...

x=12000-y-z.......substitute to the first two equations
.25(12000-y-z)+1y+.5z=10700
.35(12000-y-z)+1.5y+.5z=15820

multiply it out and now u have 2 variables and can solve easy...once u have y and z.......u can plug it back in for x