This one from CrackGMAT:
My answer is B. I would agree with the OA which is D if they use pi instead of 22/7. Please comment
Is the radius of circle with center O a whole number?
(I) The circumference of the circle is 16 * (22/7)
(II) The ratio of the circumference of the circle to the area of the circle is ¼
D is correct.
22/7 is the definition of Pi and in maths they are the same thing.
For statement 1) 16*(22/7) is not a whole number but we are asked for the radius
2PiR = 16*(22/7)
R=16*(22/7) divided by 2Pi
The answer is yes which means this statement is sufficient.
Statement 2) is sufficient I think you've determined but it comes down to the Radius being 8 as well. So both are sufficient.