rafi wrote:

What is the greatest common divisor of a and b?

(1) a is divisible by 15.

(2) b=2a

Couldn't understand this one. How do you approach this sort of questions?

I think the question is wrong as far as the wording goes..

The question should say..

What is the VALUE of the common divisor of a and botherwise..from statement (2) it can be clearly be said that "a" is the common divisor

Bunuel please give your inputs on this.

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