# A frog is at the bottom of the well which is 20 meters deep. Everyday the frog jumps 5 meters upwards and fall 4 meters down. How many days it will take for the frog to reach the top?

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jumps 5m

falls 4m

therefore,distance covered in 1 day= 5-4

=1m

let no of days to cover 20m be x

therefore days taken to cover 20m = 20 *1

=20 days

it will take 20 days for frog

the frog jump every day 5-4=1m

so the distance covered

first day=1m

second day=2m

third day =3m

and so on.

but on 15th day =15m

and on 16th day=20m

as every day he jump 5m and slip 4m due to wall