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27 Mar 2023, 01:30
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
43% (02:38) correct
57%
(01:37)
wrong
based on 96
sessions
History
Date
Time
Result
Not Attempted Yet
After an attempted breakout at Folsom State Prison, the warden lines the prisoners up for a headcount. (Assume the warden counts correctly and that no prisoners switch positions or leave/escape during either headcount.) When the warden counts from left to right, Gurby is the 20th prisoner counted, but when the warden counts from right to left, Gus is the 20th prisoner counted. How many prisoners are lined up for the headcount?
(1) There are 13 prisoners between Gurby and Gus.
(2) The total number of prisoners is odd
(1) There are 13 prisoners between Gurby and Gus.
(2) The total number of prisoners is odd
27 Mar 2023, 04:56
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(1) There are 13 prisoners between Gurby and Gus.
19-Gurby-13-Gus-19
Total=53 prisoners.
=> (1) is sufficient.
(2) The total number of prisoners is odd.
Clearly, not sufficient. As total prisoners can be 53(as seen above), 51, or any other odd number.
=> (2) is not sufficient.
IMO A
19-Gurby-13-Gus-19
Total=53 prisoners.
=> (1) is sufficient.
(2) The total number of prisoners is odd.
Clearly, not sufficient. As total prisoners can be 53(as seen above), 51, or any other odd number.
=> (2) is not sufficient.
IMO A
28 Mar 2023, 07:08
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Bunuel
(1) There are 13 prisoners between Gurby and Gus.
Note in both the below cases Gurby is 20 places to the right and Gus is 20 places to the left.
We do not know whether Gurby is to the right or left of Gus.
\(19 +\) Gurby \(+ 13 +\) Gus \(+ 19= 43 \)
\(5 +\) Gus \(+13 +\) Gurby \(+ 5 = 25\)
INSUFF.
(2) The total number of prisoners is odd
We do not know how many are between Gurby and Gus, or the Position of Gurby and Gus relative to each other.
There could be any number of odd prisoners between these two.
INSUFF.
1+2
We do not know whether Gurby is to the right or left of Gus.
There could be \(43\) or \(25\) prisoners in total as seen from (i) depending upon the position of Gurby and Gus relative to each other.
INSUFF.
Ans E
Hope it's clear.
