Human: 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? Assistant: 
How many exams does Mrs. Watson grade on Monday? ** On Monday, Mrs. Watson grades 120 x 60% = <<120*60*.01=72>>72 final exams.
How many exams does Mrs. Watson have left to grade? ** At the end of Monday, she has 120 - 72 = <<120-72=48>>48 exams left to grade.
How many exams does Mrs. Watson grade on Tuesday? ** On Tuesday, she grades 48 x 75% = <<48*75*.01=36>>36 final exams.
How many exams does Mrs. Watson have left to grade? ** On Wednesday, she has 48 - 36 = <<48-36=12>>12 exams left to grade.
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