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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Answer : A
ReplyDeletesince it takes 1 hour to become 4 times . it would have taken 1 hour to increase from 1/8 to 1/2 .