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题库 / OG2017Q-DS-198
If Ann saves x dollars each week and Beth saves y dollars each week, what is the total amount that they save per week?
(1) Beth saves $5 more per week than Ann saves per week.
(2) It takes Ann 6 weeks to save the same amount that Beth saves in 5 weeks.
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：
计算两人每周节省的总金额，即x+y。
（1） Beth每周必Ann多节省5美元，即y=x+5，不能算得x+y。
（2） Ann6周节省的钱和Beth5周节省的一样多，即6x=5y，也不能算得x+y。
结合条件1和条件2，6x=5*(x+5)，算得x=25，所以y=30，因此Ann和Beth每周共节省25+30=55美元。
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。