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Divisibility by 11

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Divisibility by 11

by pharmxanthan » Sun Jul 25, 2010 4:02 pm
If m and z are integers, is z divisible by 11?
(1) m is a two-digit number with equal tens and units digits.
(2) m - z is divisible by 11.


[spoiler]OA is C

If m=11 and z=0, then z is not divisible by 11. Is OA wrong? [/spoiler]
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Source: — Data Sufficiency |

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by Rahul@gurome » Sun Jul 25, 2010 7:12 pm
It is obvious that (1) and (2) alone are not sufficient.
(1) alone means m is divisible by 11.
Combine both the statements and check.
We then get that z is divisible by 11.
Note that 0 is divisible by every other integer apart from itself.

The correct answer is hence (C).
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