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题库 / OG2017Q-DS-237
If x and y are integers, what is the value of y ?
(1) xy = 27
(2) x = y2
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 statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目分析：
（1） 仅知道xy的值无法解得y的值。
（2） 仅知道x = ~$y^2$~也无法确定y的值。
结合条件1和条件2，将条件2的式子代入条件2得~$y^3=27$~，解得y=3。题目得解
因此，本题答案为（C），两个条件结合起来才能解题，任何单独一个均不行。