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bacteria quadruples

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bacteria quadruples

by sanju09 » Fri May 07, 2010 2:48 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) 4:00 a.m.
(B) 5:00 a.m.
(C) 6:00 a.m.
(D) 7:00 a.m.
(E) 9:00 a.m.
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by liferocks » Fri May 07, 2010 3:33 am
Ans option E 9am

if the container was one-eighth full in xhr after 1 hr it will be 4/8 or 1/2 full which is at 10am
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by pradeepkaushal9518 » Fri May 07, 2010 4:35 am
at 9 am suppose it was one eighth full. after one hour it quadruples hence 1/8*4=1/2 half full at 10 am

so E
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