Lizzy: Mrs. Watson is grading 120 final exams from her American History class. On Monday, she grades 60% of the exams. On Tuesday, she grades 75% of the remaining exams. On Wednesday, how many more exams does she need to grade?.
Me: Hmmm, let me think. I think this is the detailed solution:
On Monday, Mrs. Watson grades 120 x 60% = 72 final exams. At the end of Monday, she has 120 - 72 = 48 exams left to grade. On Tuesday, she grades 48 x 75% = 36 final exams. On Wednesday, she has 48 - 36 = 12 exams left to grade. Final answer: 12.