self Maths Puzzle

A snail creeps 7 ft up a wall during the daytime. After all the labor it does throughout the day, it stops to rest a while... but falls asleep!! The next morning it wakes up and discovers that it has slipped down 3 ft while sleeping.

If this happens every day, how many days will the snail take to reach the top of a wall 83 ft in height?

Read Solution (Total 3)

21 days it take to reach.

On the first day, the snail climbs up 7 ft and slips down 3 ft while sleeping.

So, next morning, it is 4 ft from where it started. The snail thus travels 4 ft upwards every day. Therefore, in 20 days, it has traveled a distance of 80 ft from the bottom.

Here lies the catch to the problem!
On the last day, the snail travels 7 ft upwards and hence reaches the top of the wall in a total of 21 days.
12 years agoHelpfull: Yes(1) No(0)

Ans 20 days
snail's one day up creep 7-3=4 ft
After 19 days,it will be up by 19*4=76 ft
On 20th day it will reach 76+7=83 ft, at the top
12 years agoHelpfull: Yes(1) No(3)
21 day he will take to reach.
12 years agoHelpfull: Yes(0) No(0)

self Other Question

Suppose 5 monkeys take 5 minutes to eat 5 bananas.
1.How many minutes would it take 4 monkeys to eat 4 bananas?
2.How many monkeys would it take to eat 15 bananas in 15 minutes? Your teacher has a total of 36 chalks. When a chalk reduces to 1/6 of its original size, it gets too small for her to hold for writing and hence she keeps it aside. But your teacher hates wasting things and so, when she realizes that she has enough of these small pieces to join and make another chalk of the same size, she joins them and uses the new chalkstick. If she uses one chalk each day, how many days would the 36 chalks last?