GMAT OG2019 数学DS新题第249题(附解析)

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249. Was the amount of John’ s heating bill for February greater than it was for January ? 

(1) The ratio of the amount of John's heating bill for February to that for January was 26/25.

(2) The sum of the amounts of John's heating bills for January and February was $183.60.

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

John二月份的取暖费比一月份的多吗?

(1) John二月取暖费与一月取暖费之比是26/25。

(2) John一月和二月的取暖总额是183.60美元。

解题思路

要对比二月份和一月份的取暖费谁多谁少,要么知道二月份和一月份各自的取暖费,要么要知道他们之间比的关系。

(1) 二月和一月取暖费的比是26:25,可知道二月的取暖费比一月的要多,条件充分;

(2) 知道两个月的总共的取暖费用,但是无法知道两者的关系,条件不充分。

正确答案: A

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