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by dabulaila » Sat Aug 18, 2007 2:47 am
A certain culture of bacteria quadruples every hour. If a container with these bacteria was half full at 10:00 a.m., at what time was it one-eighth full?
(A) 9:00 a.m.
(B) 7:00 a.m.
(C) 6:00 a.m.
(D) 4:00 a.m.
(E) 2:00 a.m.
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by keepsmilinyaar » Sun Aug 19, 2007 5:24 am
Is the answer (A) - 9 am

Assume the total number of bacteria to fill the container is 'x'.
The container contains 'x/2' at 10 am.

the question requires when the container would contain 'x/8' bacteria.

As the bacteria quadruples (i.e becomes 4 times. ) after 1 hr.
Therefore the clock needs to go one hour behind so that the container goes from 'x/2' / 4 ==> 'x/8' .


Kindly paste the correct answer.
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Junior | Next Rank: 30 Posts
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by dabulaila » Tue Aug 21, 2007 12:11 am
I guess yes,, thank you!
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