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# In a Lake, there is a patch of lily pads. Every day, the patch doubles

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Manager
Joined: 12 Nov 2015
Posts: 55
Location: Uruguay
Concentration: General Management
Schools: Goizueta '19 (A)
GMAT 1: 610 Q41 V32
GMAT 2: 620 Q45 V31
GMAT 3: 640 Q46 V32
GPA: 3.97
In a Lake, there is a patch of lily pads. Every day, the patch doubles  [#permalink]

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25 Jun 2016, 16:59
00:00

Difficulty:

15% (low)

Question Stats:

88% (01:34) correct 13% (00:59) wrong based on 23 sessions

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In a Lake, there is a patch of lily pads. Every day, the patch doubles in size. It takes 48 days for the patch to cover the entire lake, how many days would it take the patch to cover half of the lake?

A) 36
B) 2^4*3
C) 24
D) 38
E) 47

Source: Professor Shane Frederick's Cognitive Reflection Test.
(I noticed the question had not disembarked yet on GMATClub)
Manager
Joined: 25 Jun 2016
Posts: 60
GMAT 1: 780 Q51 V46
Re: In a Lake, there is a patch of lily pads. Every day, the patch doubles  [#permalink]

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25 Jun 2016, 17:35
Working backward from the day it's covered:

day 48: fully covered
day 47: half covered

So 47 days
Math Expert
Joined: 02 Sep 2009
Posts: 62496
Re: In a Lake, there is a patch of lily pads. Every day, the patch doubles  [#permalink]

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25 Jun 2016, 23:06
Avigano wrote:
In a Lake, there is a patch of lily pads. Every day, the patch doubles in size. It takes 48 days for the patch to cover the entire lake, how many days would it take the patch to cover half of the lake?

A) 36
B) 2^4*3
C) 24
D) 38
E) 47

Source: Professor Shane Frederick's Cognitive Reflection Test.
(I noticed the question had not disembarked yet on GMATClub)

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Re: In a Lake, there is a patch of lily pads. Every day, the patch doubles   [#permalink] 25 Jun 2016, 23:06
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