If there are x men and y women in a choir, and there are z more men than there are women in that choir, what is z?

(1) x2 - 2xy + y2 - 9 = 0

(2) x2 + 2xy + y2 - 225 = 0


Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

Both statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOT sufficient.