The number of students who scored 100% is 2/5*80 = <<2/5*80=32>>32

Out of the 80 students, 80-32 = <<80-32=48>>48 did not score 100%.

If 50% of the students who did not score 100% managed to score over 80%, then 50/100*48 =<<50/100*48=24>>24 students scored over 80%

The number of students who failed is 48-24 = <<48-24=24>>24

# Answer

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<|im_start|>system
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<|im_start|>user
Out of the 80 students who took the biology exam, only 2/5 of them managed to score 100%. If a score below 80% qualified as failing, and 50 percent of the remaining students who didn't score 100% managed to score over 80%, calculate the number of students who failed the exam.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
24
Out of the 80 students who took the biology exam, only 2/5 of them managed to score 100%. If a score below 80% qualified as failing, and 50 percent of the remaining students who didn't score 100% managed to score over 80%, calculate the number of students who failed the exam.
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