Adding J’s car creates many new possibilities. It’s not worth it to figure them all out, there are dozens of new scenarios.
The fastest and easiest way to solve this question is to try and make workable scenarios to eliminate the four wrong answers.
This scenario shows that B is wrong:
This scenario shows that C is wrong:
This scenario shows that D and E are wrong:
A is CORRECT.
Under the old rules, O could only be 2 or 3. In either case his car got a regular wash.
Now that J is here, O’s car can be washed 2nd, 3rd or 4th.
If O’s car is washed 2nd or 3rd, the wash can’t be premium. There’s still only one premium (rule 1) and the 2nd and 3rd cars get the same kind of wash.
Here’s an example:
If O’s car is washed 4th, O’s wash comes right before M’s, and that means they’re both regular (rule 6):
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Jordan says
How did you know J would be first?
FounderGraeme says
I didn’t. Those are just examples that “could be true”. They let us eliminate answers.