SOLUTION: In a large class, 80 students took a test. When the test papers were rated, it was found that 10% of the students had A papers, 23% had B papers, 30% had C papers, 15% had D papers

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Question 159659: In a large class, 80 students took a test. When the test papers were rated, it was found that 10% of the students had A papers, 23% had B papers, 30% had C papers, 15% had D papers, and the rest failed. How many students failed the test?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
80-(.10+.23+.30+.15)*80=80-(.78*80)=80-62.4=17.6 or 18 students failed.