GMAT OG2019 数学DS新题第288题(附解析)

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288. On June 1, Mary paid Omar $360 for rent and utilities for the month of June. Mary moved out early, and Omar refunded the money she paid for utilities, but not for rent, for the days in June after she moved out. How many dollars did Omar refund to Mary ?

(1) Mary moved out on June 24.

(2) The amount Mary paid for utilities was less than 15 the amount Mary paid for rent.

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

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

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. Each statement ALONE is sufficient.

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

题目大意

6月1日,Mary付给Omar360美元用于支付6月份的房租和水电费。Mary早早地搬了出去,Omar退还了她支付的水电费,但房租没有退还。Omar退给Mary多少美元?

(1) 玛丽于6月24日搬走了。

(2) 玛丽支付的水电费低于玛丽支付的租金。

解题思路

360等于水电费加上房租,不管是知道Mary是何时搬走的,还是知道水电费比房租要少,或者两者都同时知道,我们都无法求出Omar退给Mary的水电费是多少美元。所以不管是那种情况下,条件都不充分。

正确答案: E

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