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Question

Every 20 minutes, one bacterium divides into two. How many bacteria will be produced after two hours, if one starts with 10 bacteria?

A
25×10
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B
25×105
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C
26×10
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D
26×106
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Solution

The correct option is B 26×10
According to the question, in a 20 minutes cycle, cells double. In 2 hours i.e 120 minutes there will be 6 cycles of 20 min each. If we start from 10 bacteria, then after 6 cycles of 20 minutes each (2 hours in total), we will have 10x 2^6 cells after 2 hours.

So, the correct answer is '2^6 x 10'.

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