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SCIENCE QUESTION!!!??!?!?
A biologist notices that a petri dish is becoming covered with colonies of bacteria. The doubling rate of the bacterial colonies is one day. At the end of 30 days, the plate is covered with bacteria. When was the petri dish half-covered with bacteria?
The bacteria double everyday
that means petri dish was half covered on 29th day.
proof
ie on day 1- 1 then on day2 2, day-3 4, day-4 - 8 , 16,32,64..............
You will observe that it forms a Geometric Progression.
1,2,4,8,16,32,64..............
first term = 1
common ratio - 2
30th term - ar^29= 2^29
half it.
2^28.
it is clear that it is 29th term.
so ans = 29
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