Posted by mike on Saturday, December 19, 2009 at 10:07pm.
Define the following new variables:
X to A = w
X to B = x
Y to A = y
Y to B = z
Here is what you know:
w + x = 32
y + z = 8
w + y = 22
x + z = 18
You have four equations in four unknowns, but they are not independent. You need another equation. One that you can write is:
220w + 300x + 400y +180z = 9280
220w + 300(32-w) + 400(22-w) +180(8-y) = 9280
Turn this into an equation for w and y, and combine it with w + y = 22. That wil let you solve for w and y. After that, the others are easy.
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