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30 Jan 2019, 00:47
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
52% (01:25) correct
48%
(01:36)
wrong
based on 231
sessions
History
Date
Time
Result
Not Attempted Yet
Water lily grows at such a rate that it covers double the surface that it covered the day before. It takes 30 days for a water lily to cover the entire surface of the pond. How long would it take for two water lilies of the same size to cover the entire surface of the same pond?
A. 8.33
B. 12.5
C. 15
D. 20
E. 29
A. 8.33
B. 12.5
C. 15
D. 20
E. 29
30 Jan 2019, 00:49
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Bunuel
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30 Jan 2019, 01:02
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Bunuel
There is 1 water lily at the beginning.
After 1 day, there will be 2 water lilies.
After 2 days, there will be 4 water lilies.
and so on till the pond is covered in 30 days.
What happens if we start with 2 water lilies? We are at the same state as we were at the end of Day 1. So we will take another 29 days to cover the pond.
All that happens is that we save 1 day in which 1 water lily had doubled to become 2 water lilies.
Answer (E)
