You can
put this solution on YOUR website!I have added the equations to your question. The three equations you have to work with are

....

...and

. To solve, you first need to solve A=2B for B so that you can plug it into the last equation. Once you do this, you get

, which is the same as

. Now you can plug this and the other equation in to get

. Combine like terms to get

. Solve to get

and then finally

. To get B and C, simply plug in A to the original equations:

....B = 7000.

....C = 14500.