Counting number of students who have failed in all four subjects – math.stackexchange.com

Counting number of students who have failed in all four subjects – math.stackexchange.com

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In an examination of a certain class, at least $69\%$ of the students failed in P, at least $72\%$ failed in C, at least $80\%$ failed in M, and at least $85\%$ failed in B. How many at least must ...

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