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A frog fell into 30 metres deep well and...

A frog fell into 30 metres deep well and tries to get out, it goes 3 metres up and fall 2 metres every day. Calculate the no. of days it take to get out.

A

30 days

B

28 days

C

15 days

D

24 days

Text Solution

Verified by Experts

The correct Answer is:
B
According to the question
`1^(st)` day it rises 1 m
`2^(nd)` day it rises 2 m i.e. (1 + 1) m
3rd day it rises 3 m i.e. (2 + 1) m
`27^(th)` day it rises 27 m i.e. (26 +1) m
But on `28^(th)` day by climbing 3 metres it gets out, no chance for slip or fall again i.e. (27 + 3) m = 30 m.
Therefore, in 28 days it will get out of well.
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