Ek khambe ki unchai 21 feet h agr ek chiti ek din me 5 feet chadhti hai aur 3 feet neeche gir jaati h to wo kitne din me khambe pr chadh jayegi
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Answer:
On the 9th day.
Step-by-step explanation:
Climbs up by 5 feet and climbs down by 3 feet everyday. Net climb = 5+ (-3) = 2 feet
Since climbing up is done first, on the last day of climb it will climb 5 feet and reach the top and will not climb down becase it has reached the top. Therefore, by the time before te last day, it should have climbed = 21 - 5 = 16 feet through climbing up ad down.
now by climbing up and down,
on net basis, 2 feet is covered in 1 day
1 feet is covered in 1/2 days
16 feet is covered in 1/2*16 = 8 days.
This 8 days and the last day when it climbs the last 5 feet makes it a total of 8+1 = 9 days to climb.
Answer: 9 days.
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