Discussion
Six people A, B, C, D, E, and F are living in a six-storey building, but not necessarily in the same order. C’s floor is lower than D but immediately higher than A’s floor. B’s floor is higher than E’s floor but immediate lower than F’s floor. If A’s floor is immediately higher than F’s floor, then who amongst the six is on the top floor?
Answer: C
Take the conditions one at a time. A's floor is immediately higher than F's, and C's floor is immediately higher than A's, so F, A and C occupy three consecutive floors in that order going up. B is immediately below F, so B comes just under F. E is lower than B, so E is at the bottom. From the bottom the order is E, B, F, A, C, and since C is lower than D, D must be above C on the sixth floor. D is therefore on the top floor, option (C). F, E and C all lie below D, so they cannot be on the top floor.
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