A lake has rare breed of lotuses that triple in number every minute If one third of the lake is full...........

Quantitative Aptitude ( CCS) Simplification

A lake has rare breed of lotuses that triple in number every minute. If one third of the lake is full of flowers in 30 min, what is the total time taken for the whole lake to be full?

1 min

31 min

90 min

60 min

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Explanation:

After 30 minutes, the population fills up 1/3 of the lake.
If the population triples every minute, then in 1 more minute, the population will be 3 times 1/3, which equals 1.
So, it will take 1 more minute for the lake to be full.
The total time is 30+1 = 31 min

Hence, option 2 is the correct answer.