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Some computers at a certain company are Brand X and the rest

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Some computers at a certain company are Brand X and the rest  [#permalink]

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New post 09 Oct 2008, 05:10
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.

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 sufficien

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Re: math---computer  [#permalink]

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New post 09 Oct 2008, 05:15
1
D:

A: x- y = 80 ..also we have y /x = 5/6 => y = 5x/6

x - 5/6x = 80 => x = 480 and so y will be 400

A is suff.
----------
B:total computer is 880 .. and we have y/x : 5/6 means 11Z = 880 => Z = 80

so x will be 480 and y will be 400

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Re: math---computer  [#permalink]

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New post 10 Oct 2008, 04:57
[quote="albany09"]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.

Y = 5Z, X= 6Z

TOTAL COMPUTERS = 11Z, WHAT IS Z

FROM 1

6Z - 5Z = 80...........SUFF

FROM 2

11Z = 880.....SUFF

D is my answer

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Re: math---computer &nbs [#permalink] 10 Oct 2008, 04:57
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