October 2011 LSAT - Section 2 - Question 20

It is fully determined which of the shelves each of the books is placed on if which one of the following is true?

Sophie July 22, 2020

Why is the answer A and not C?

I am having trouble creating a setup that shows more books on the bottom shelf than the top if I and M are together. Thanks!

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Emil-Kunkin June 14, 2023

Hi, let's see what happens if we put I and M together.

T:
M: I M
B:

We know that F is with M, and that K is higher than FM so we know we have

T: K _
M: I M F
B: _ _ _

Since we know that o must be higher than L, we know that O must be on the top, L on the bottom, and since we must have three or more on the bottom, our two floaters of G and H are also on the bottom

T: K O
M: I M F
B: LGH

For C we do not know for sure where everything goes.

We know that the only rung with room for L F and M is the bottom so we will have

T:
M: I
B: L F M

But there isn't anything else we know for sure to be true.