Some computers at a certain company are Brand X and the rest are Brand Y. If the ratio of the number of Brand Y computers to the number of Brand X computers at the company is 5 to 6, how many of the computers are Brand Y ?

(1) There are 80 more Brand X computers than Brand Y computers at the company.

(2) There is a total of 880 computers at the company.


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.

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题目分析：

设品牌Y电脑有y台,品牌X电脑有x台，所以，y/x =5/6，x=6y/5

（1）  品牌X电脑比品牌Y多80台，所以，x=y+80，有6y/5=y+80，解得y=400，题目得解。

（2）  两个品牌电脑共880台，所以x+y=800，有6y/5+y=880，解得y=400，题目得解。

因此，本题答案为（D），任何一个条件说明均能解题。

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