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24 Feb 2017, 13:36
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
79% (01:31) correct
21%
(02:10)
wrong
based on 103
sessions
History
Date
Time
Result
Not Attempted Yet
The number of flights leaving a certain airport doubles during every one-hour period between its 9 A.M. opening and noon; after noon, the number of flights leaving from the airport doubles during every two-hour period. If 4 flights left from the airport between 9 and 10 a.m., how many flights left the airport between 2 and 4 P.M.?
(A) 32
(B) 48
(C) 64
(D) 128
(E) 256
(A) 32
(B) 48
(C) 64
(D) 128
(E) 256
24 Feb 2017, 14:05
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SajjadAhmad
Hi,
9 to 10 = X
10 to 11 = 2X
11 to Noon = 4X
Noon to 2 P.M. = 8X
2 P.M. to 4 P.M. = 16X
and X = 4 so 16X = 64
Ans. C
24 Feb 2017, 15:41
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It's interesting to note that the right answer can't be A or B, since it needs to be a power of 2. (If you double 4 repeatedly, you'll only ever end up with powers of 2). This could be a good basis for a fast guess.
