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Each of the offices in a certain building has a floor area

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Each of the offices in a certain building has a floor area [#permalink] New post 18 Sep 2006, 17:31
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Answer to the following is E. Could someone please explain? Thanks.

Each of the offices in a certain building has a floor area of 200, 300, or 350 square feet. How many offices are on the first floor of the building?

(1) There is a total of 9500 square feet of office space on the first floor of the building.

(2) Ten of the offices on the first floow have areas of 350 square feet each.
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Re: GMAT Prep - DS [#permalink] New post 18 Sep 2006, 17:49
wshaffer wrote:
Answer to the following is E. Could someone please explain? Thanks.

Each of the offices in a certain building has a floor area of 200, 300, or 350 square feet. How many offices are on the first floor of the building?

(1) There is a total of 9500 square feet of office space on the first floor of the building.

(2) Ten of the offices on the first floor have areas of 350 square feet each.


1) gives us total area, but there are many different ways to add 200, 300 or 350. 2) gives us 10 offices, but we don't know the total area.

If we consider both then we know that 9500 - 10*350= 6000, once again you can have 30 offices with 200 square feet each or 20 offices with 300 square feet each or combination of 200, 300 and 350.
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 [#permalink] New post 19 Sep 2006, 02:04
Pretty straightforward.

1) Tells us nothing about the possible breakup of offices. Could be a number of combinations. INSUFFICIENT.
2) Tells us nothing about total office space or total square footage of other office types. INSUFFICIENT.

Taken together we know 10 @ 350 = 3500, so we have 6000 sq feet remaining, but still could be any combo of 200 and 300 sq foot offices.
  [#permalink] 19 Sep 2006, 02:04
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