Problem Solving (PS) | You score 80 on your mid-term exam and 100 on your final exam. Only

genxer123 thank you very much for the quick reply. This makes everything so much easier. Earlier, I was referring to the Teeter-totter method being a little too difficult to use on the GMAT, given that you not only have to create the visual but also compute the values. Therefore, I was looking for a way to solve this using algebra but I could not figure it out. I appreciate that you went into great detail as well as helping me visualize it further with the ratio method. Thanks again, cheers.