Committee X and Committee Y, which have no common members, will combine to form Committee Z. Does Committee X have more members than Committee Y?
I. The average (arithmetic mean) age of the members of Committee X is 25.7 years and the average age of the members of Committee Y is 29.3 years.
II. The average (arithmetic mean) age of the members of Committee Z will be 26.6 years.

if statement I alone is sufficient, but statement II alone is not sufficient to answer the question.

if statement II alone is sufficient, but statement I alone is not sufficient to answer the question.

if both statements taken together are sufficient to answer the question, but neither statement alone is sufficient.

if statements I and II together are not sufficient, and additional. data is necded to answer the question.