I have an exam coming up the day after tomorrow and I am completely unable to get the correct answer for this question.
First off, I'd like to confirm I'm doing the last equation correctly. (apologies, but I'm not sure on how to use the math notation)
17 - Cr(sq) = 17 - 7Cr - 0.98Cr(sq)
17 = 17 - 7Cr + 0.02Cr(sq)
0 = -7Cr + 0.02Cr(sq)
-0.02Cr(sq) = -7Cr
-0.02Cr = -7
Cr = 350
Is this correct?