In the telephone number 936-215X, what digit does X represent?

(1) Only one digit in the telephone number is greater than X.
(2) X is the greatest of the digits not among the telephone number’s first six digits.

It should be B.

(2) X is the greatest of the digits not among the telephone number’s first six digits.


Find the digits that are not among the telephone number's first six digits.
8,7,4,0 ..

greatest of {8,7,4,0} is 8.
Sufficient


In the telephone number 936-215X, what digit does X represent?

(1) Only one digit in the telephone number is greater than X.
(2) X is the greatest of the digits not among the telephone number’s first six digits.
_________________

The second sentence is awkward. The guy who wrote this needs to desperately go through the Manhattan SC guide before framing DS questions in the future.

1. 7 OR 8 NS
2. (0, 4, 7, 8) are the numbers left not among the telephone numbers first six. And the greatest is what X is! so its 8. Sufficient.

ANSWER: B

More of a verbal question then Quant!


_________________

In the telephone number 936-215X, what digit does X represent?

(1) Only one digit in the telephone number is greater than X --> x could be 7 or 8. Not sufficient.

(2) X is the greatest of the digits not among the telephone number’s first six digits. The digits that are NOT in the telephone number are: 0, 4, 7 and 8. Greatest among them is 8. Hence x is 8. Sufficient.

Answer: B.

Hope it's clear.
_________________

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________