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Intern
Joined: 07 Sep 2008
Posts: 25

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06 Oct 2008, 16:04
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a certain culture of bacteria quadruples every hour. if a container with these bacteria was half full at 10.00 am, at what time was it one-eighth full?

a: 9am
b: 7am
c: 6am
d:4am
e: 2 am

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VP
Joined: 18 May 2008
Posts: 1201

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06 Oct 2008, 19:02
if it quadruples then one hour before, it was 1/4 *1/2=1/8
Hence A
andreasonlinegr wrote:
a certain culture of bacteria quadruples every hour. if a container with these bacteria was half full at 10.00 am, at what time was it one-eighth full?

a: 9am
b: 7am
c: 6am
d:4am
e: 2 am

Last edited by ritula on 07 Oct 2008, 00:02, edited 1 time in total.
Manager
Joined: 01 Jan 2008
Posts: 221
Schools: Booth, Stern, Haas

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06 Oct 2008, 23:19
what does the word "quadruples" mean? does it mean that 2 litres become 8 litres in hour or 16 litres in hour?
SVP
Joined: 17 Jun 2008
Posts: 1502

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06 Oct 2008, 23:57
kazakhb wrote:
what does the word "quadruples" mean? does it mean that 2 litres become 8 litres in hour or 16 litres in hour?

It will mean "multiply four times".
Manager
Joined: 01 Jan 2008
Posts: 221
Schools: Booth, Stern, Haas

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07 Oct 2008, 00:33
ritula wrote:
if it quadruples then one hour before, it was 1/4 *1/2=1/8
Hence A
andreasonlinegr wrote:
a certain culture of bacteria quadruples every hour. if a container with these bacteria was half full at 10.00 am, at what time was it one-eighth full?

a: 9am
b: 7am
c: 6am
d:4am
e: 2 am

can you write more detailed way of solution pls
Retired Moderator
Joined: 05 Jul 2006
Posts: 1741

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07 Oct 2008, 03:57
andreasonlinegr wrote:
a certain culture of bacteria quadruples every hour. if a container with these bacteria was half full at 10.00 am, at what time was it one-eighth full?

a: 9am
b: 7am
c: 6am
d:4am
e: 2 am

(1/8)*4 = 1/2 ie: one increase of 4 times happened in one hour( given ) thus 9 am is the answer
Manager
Joined: 25 May 2008
Posts: 185

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07 Oct 2008, 05:45
Is A. Since at 10 was 1/2, at 9 was 1/2/4= 1/2 X1/4= 1/8

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: ps   [#permalink] 07 Oct 2008, 05:45
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