A problem by Mahi Narendra

Level pending

A frog is at the bottom of a 78 meter well. Each day he leaps 4 meters up the well. At night, while he is asleep, he slips 2 meters backward.
How many days does it take him to escape from the well?


The answer is 38.

Mahi Narendra by Mahi Narendra , 30, India

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2 solutions

Md Fazil
Jul 6, 2014

Solution is not 39 ! Its 38 !! After the 37th night it will be at 74m so on the 38th day it will jump 4m and reach 78m, the top of the well

7 Helpful 0 Interesting 0 Brilliant 0 Confused

True Md Fazil

Faisal Amin - 6 years, 11 months ago

What kind of question is this.The one who posted the question only doesn't know the correct answer.I wonder how some people got this question right.

Anuj Shikarkhane - 6 years, 11 months ago

However I got it on my third chance!

Anik Mandal - 6 years, 11 months ago

Thank you. I have updated the answer to 38.

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Calvin Lin Staff - 6 years, 11 months ago

very clear explanation!!

subha jayanthi - 6 years, 9 months ago

at night, while he sleeps, he slips backwards, not down.

Kelly Brodigan - 6 years, 1 month ago
Sonali Srivastava
Jul 18, 2014

At the end of 37th day frog will reach 74 m, on 38th day it will jump 4 more meters n total becomes 78 m.Frog reaches 78m on 38th day n escapes (no need of night slipping of 2m)

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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