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23 Sep 2010, 16:22
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
67% (01:54) correct
33%
(01:35)
wrong
based on 9
sessions
History
Date
Time
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Not Attempted Yet
In a certain conference room each row of chairs has the same number of chairs, and the number of rows is 1 less than the number of chairs in a row. How many chairs are in a row?
(1) There is a total of 72 chairs
(2) After 1 chair is removed from the last row, there is a total of 17 chairs in the last 2 rows
OPEN DISCUSSION OF THIS QUESTION IS HERE: in-a-certain-conference-room-each-row-of-chairs-has-the-same-129389.html
(1) There is a total of 72 chairs
(2) After 1 chair is removed from the last row, there is a total of 17 chairs in the last 2 rows
OPEN DISCUSSION OF THIS QUESTION IS HERE: in-a-certain-conference-room-each-row-of-chairs-has-the-same-129389.html
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23 Sep 2010, 16:48
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First, the question should have had "rows" and not "rooms", if "rooms" then answer is straight E.
so basically it is saying that there are N chairs in a row and that there are N-1 rows.
1) N (N-1) = 72. Only one way N=9
2) Remove 1 chair from the last row, you have N + N-1 chairs, that is 2N-1=17, N=9
So D
so basically it is saying that there are N chairs in a row and that there are N-1 rows.
1) N (N-1) = 72. Only one way N=9
2) Remove 1 chair from the last row, you have N + N-1 chairs, that is 2N-1=17, N=9
So D
23 Sep 2010, 16:52
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TomB
There is an error in the question.
Known: The number of chairs = no. of rows * (no. of chairs in a row)
Given the no. of rows = (no. of chairs in a row -1)
Statement 1: 72 = no. of rows * (no. of chairs in a row)
72 = (no. of rows) * (no. of rows + 1)
72 = (8*9) . Hence the number of chairs in a row is 9. Sufficient.
Statement 2: Given (2 * no. of chairs in a row) -1 = 17. Num of chairs = 9. Sufficient.
Hence answer is D.
