Discussion
Each of K, L, M, N, O and P has to join a meeting on a different day of a week starting from Monday and ending on Saturday of the same week. Only M has to join the meeting before O. K has to join the meeting on Wednesday. L has to join the meeting on one of the days after P. Only one person has to join the meeting between L and P. Who has to join the meeting on Friday?
Answer: A
N joins the meeting on Friday. Number the days Monday 1 to Saturday 6. ‘Only M has to join the meeting before O’ means M is the only person who comes before O, so M is on Monday and O is on Tuesday. K is on Wednesday. That leaves Thursday, Friday and Saturday for N, P and L.
L joins after P with exactly one person between them, so P and L must be two days apart. Among Thursday, Friday and Saturday the only such pair is Thursday and Saturday, with P on Thursday and L on Saturday. N is left with Friday. P, L and O are therefore all on other days, which rules out options B, C and D.
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