Remember the deduction from the setup: only the pickup and the limousine can go last. This question places the sedan before the pickup. Therefore the order is L – S – P (rule 4) and the pickup must be last:
The sedan goes friday because the pickup needs the sedan or the van beside it. And the van can’t go Friday, because it’s before the roadster and the hatchback.
(So far, this is exactly the same as question 14)
Now that you have this diagram, you should use it to eliminate answers. I’m going to eliminate the easy ones first.
B is wrong because the sedan is Friday, not Wednesday.
D is wrong. The hatchback can’t go Friday because the sedan is already there.
E is wrong. The limousine can’t go Saturday because the pickup is already there.
That leaves A and C. You should always try and eliminate the answer with the most restrictions.
The van has more restrictions than the limousine, so let’s try C. But, this doesn’t work; it turns out the van can’t go Wednesday. Only Thursday is left open after the van, but both the roadster and the hatchback must come after the van.
A is CORRECT. The limousine can go Wednesday. This diagram proves it:
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