An elephant fell into a wall of depth 20mts.Everyday it climbs 4mts but at the end falls by 2mts.Find the number of days it would take for the elephant to get out of the wall

• it would take 9days to get out of the well.....
  
  morning evening
  day1: 4m .........2m
  day2: 6m .........4m
  day3: 8m .........6m
  day4: 10m .........8m
  day5: 12m .........10m
  day6: 14m .........12m
  day7: 16m .........14m
  day8: 18m .........16m
  day9: 20m...it will get out of the well
• 11 years agoHelpfull: Yes(40) No(0)
• 9
  upto 16 it goes for 8 days then for the next day that picks 20m
• 11 years agoHelpfull: Yes(37) No(1)
• first time height reduced by 18,next 16,14,12,10,08,06,04
  
  in eight attempts height becomes 4 mts. in ningth attempt elephant comes out.
  
  answer is 9 total.
• 11 years agoHelpfull: Yes(9) No(1)
• 4-2=2
  2*8=16
  16(8 days)+4(9th day)=20
  8+1 =9 days
  
• 11 years agoHelpfull: Yes(8) No(1)
• 1 day climb=4 mts
  but at end fall 2 mts
  then in one day elephent can climb only 2 meter
  hens in 8 days it can climb 16 mts
  in 9 day elephant can climb 16+4=20mts
  hense total days=9days
• 11 years agoHelpfull: Yes(5) No(0)
• every day 4-2=2 mts
  for 8 days 8*2=16 mts
  on 9th day 4 mts
  
  
  
• 11 years agoHelpfull: Yes(3) No(0)
• in a day it climbs=4-2=2mts
  in 8 dys it reaches up to 16mts
  in 9th day it goes to 20mts ant step out of the well
• 10 years agoHelpfull: Yes(1) No(0)
• from first day to 8th day the climbing and falling goes on like this
  4-2;6-4;8-6;10-8;12-10;14-12;16-14;18-16. but at ninth day ele climbs 4 mts from 16 means 16+4=20...then it can come out....damu
• 11 years agoHelpfull: Yes(0) No(0)
• in 9 attempts
  
• 11 years agoHelpfull: Yes(0) No(0)
• till 8 days it climbs= 2*8=16mts
  on the 9th day it climbs 4 mts=16+4=20mts
  the answer is it takes 9 days
• 11 years agoHelpfull: Yes(0) No(0)
• in 8 days = 2*8=16m
  in 9 day = 16+4=20m
• 11 years agoHelpfull: Yes(0) No(1)
• Total depth =20 mts
  Everyday climbs =4mts
  At the End of the falls by =2 mts
  Than per day the elephant climbs (4-2)mts=2 mts
  it take =20/2 =10
  than the elephant take 10 days to get out from the well
• 11 years agoHelpfull: Yes(0) No(4)
• 9
  at the last 18+4=22 and its already out.
• 11 years agoHelpfull: Yes(0) No(0)
• the ans is 9 because everyday it moves up by a resultant 2m...but on the 9th day it will be able to get out of the well!!
• 11 years agoHelpfull: Yes(0) No(0)
• 9....20/(4-2)-1=9...
• 11 years agoHelpfull: Yes(0) No(0)
• 1ST Day ele climbs 4mts and falls 2mts down. which means in 1day , ele can climb 2mts..
  so
  1day---2mts
  ? -----20mts
  cross multiply
  x=(20*1)/2
  x=10days..
• 9 years agoHelpfull: Yes(0) No(1)
• initial step is zero.
  0+4-2=2 day 1
  2+4-2=4 d2
  4+4-2=6 d3
  6+4-2=8 d4
  .
  .
  .
  .
  18+4-2=20 day10
• 9 years agoHelpfull: Yes(0) No(2)
• 9 days
  bcoz he climb 4mtr daily and fall 2mtr
  then he climb only 2mtr in a day
  8days in climb 16mtr and in 9th day when he climb 4mtr he rech outside the wall
  so the ans is 9 days.
• 9 years agoHelpfull: Yes(0) No(0)
• 9 days
  daily it climbs 2 mts(4 mts(up)-2mts(down))
  so it takes 10 days to reach 20 mts ,but as it climbs 4 mts up on the 9th day it reaches the top and there's no need to go 2 mts down
  so it takes 9 days to reach
• 4 years agoHelpfull: Yes(0) No(0)