



 
Hi Ben. When we say "solve for K" we mean to isolate K by itself on one side of the equal sign. You can do this by "moving" things from one side to the other using mathematical rules. The most important principle is this: I'll solve an example similar to yours: Solve for B in 0.9C  10B = A. First I subtract 0.9C from both sides of the equation:
This "moves" the 0.9C from one side to the other, because it has cancelled with the positive 0.9C on the left side of the equation. Now I have a factor of 10 in front of the B, so to move that out of there I need to cancel it away by dividing by 10. So I have to divide both entire sides by 10:
So now I have solved for B. Try your problem in a similar way, Ben. Cheers,  


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