There is no missing dollar, but there is a problem with the question. The question asks that if they have now only paid nine dollars each, and the waiter has two; where is the missing dollar? The problem is how it is all presented. The sum of the three women’s payment is 27 dollars, and this is perfectly accounted for. The cashier has 25 dollars, and the waiter has the other two. The three dollars from the original 30 are split among the three women. Seeing it from this perspective, it is easy to see there was no missing dollar at all. The question incorrectly suggested that the two dollars the waiter had were separate from the 27 dollar payment.
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Rowan Counterintuitive 
This is beautifully explained, perhaps the best I’ve read. It’s not grammatically perfect, and if you’d like to know how it could be, I’d be glad to tell you. But otherwise Bravo.
Grade B
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Thank you. How would I be able to make it grammatically correct?
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The puzzle asks, “If they have now paid only nine dollars each, and the waiter has two, where is the missing dollar?”
The sum of the three women’s payments is 27 dollars, and this is perfectly accounted for.
The question incorrectly suggests that the two dollars the waiter has are separate from the 27-dollar payment.
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