Asked by aneesh

Water lillies double in area every 24 hour. In spring there is one water lily on a lake. In sixty days, the lake is completely covered with lillies. how many days did it take to cover half the lake

Answers

Answered by Damon
1 2 4 8 16
1 2^1 2^2 2^3 2^(n-1)
a a2^1 a 2^2 ....
geometric sequence with
a = 1
r = 2
n = number of days

2^59 = area

2^x = 2^59/2
x = n-1 = 58 so 59 days
which we could have said right off
because if you cover the whole lake in 60 days then the day before you must have half the lake covered.
Answered by Vsvgshs
Answer 58
Answered by Ajjubhai 94
Anish is right
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