LG Game 4 Question 23 Explanation, by LSATHacks
This was the hardest question, I found. It was the only one where I found drawings useful (besides the main drawing).
This question asks about Tuesday, but the day doesn’t matter. This would be the exact same question if it was talking about any other day with transfer. On this game the days are just a distraction.
First, you can eliminate a couple answers. C is wrong because J can’t transfer to M (rule 1).
D is wrong because K and L pass back and forth between them. This leaves J and M to transfer between each other. But J can’t transfer to M (rule 1), so this doesn’t work.
For the other three answers, I had to make drawings of what was happening. Note that M always transfers to J (we saw this in question 20) so I drew that as well.
I’ll repeat that last line because it’s important. M always has to transfer to J. We saw this in the setup. So all the drawings include this transfer.
Note also that everyone must send and receive a transfer. Two answers are wrong because they leave one employee without a transfer partner.
A has transfers from J to K, K to M, and M to J:
This left L without anyone to transfer with.
B has transfers from J to L, L to M and M to J:
This leaves K without anyone to transfer with.
E is CORRECT. It has transfers from K to L and L to M. There’s also the routine transfer from M to J:
Finally, I drew a transfer from J to K, because J hadn’t transferred and K hadn’t received. That was just to prove to myself that this answer allowed all four people to make and receive transfer.
So E doesn’t violate any rules and it has everyone making a transfer and everyone receiving a transfer.
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What’s the difference between this question and question 21 where one piece is only swapped between two different employees?
What’s the reason behind this question requiring transfers between all four of the workers?
For A:
Mon – Thu
1, J-K-M-J
2, M-J-L-K
3, K-L-K-M
4, L-M-J-L
It still may work. Why A is wrong?
A says you need J to K, and K to M. In your diagram, J passes to L.
In the explanation, I wrote that the problem with A is that it leaves L with no one to transfer to: J to K, K to M, M to J. Who can L transfer to? The other three are spoken for.
for 23A J-K, K-M, M-J, J-L…if L is receiving it last on Tuesday, why does L MUST transfer that same day? The rule never said each employee must transfer it to someone else? Why couldn’t L just transfer it on the next day? Could you explain that?
But the question doesn’t say that each employee has to work once between Mon through Thurs., right? Letters can appear more than once on the lineup, and some letters could not appear at all?
And, is this question talking about two transfers occurring on one day (Tuesday)?
Sorry, this question is driving me nuts :/
The credited response to this question is the same sequence given to us on the credited response to the “rule” question for 19 — turning this into the easiest question for all the wrong reasons!