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Source: — Data Sufficiency |

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by Ian Stewart » Sun Feb 10, 2013 3:11 am
Statement 1 is not sufficient. Statement 2 tells us that 170 is the greatest common divisor of z and 170 -- in other words, it just tells you that z is divisible by 170. That is not sufficient either.

Combined, we know that z is divisible by both 3 and 170. So z must be divisible by the LCM of 3 and 170, which is 510. Since 100 < z < 1000, the only possible value of z is 510. So yes, the answer is C.
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

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