SOLUTION: If a student missed 13 problems on a exams, the finally grade was 87%. How many problems were on the test?

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Question 350211: If a student missed 13 problems on a exams, the finally grade was 87%. How many problems were on the test?
Answer by Alan3354(69443) About Me  (Show Source):
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If a student missed 13 problems on a exams, the finally grade was 87%. How many problems were on the test?
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100% - 87% = 13%, the %age missed.