8. 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.
Answer: A
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Solution:
ReplyDeleteA bacterium quadruples every hour means its quantity is multiplied by 4 times every hour. It was half full at 10.00 am hence it was one-eight at 9.00 am.