a snail is at the bottom of an empty trough with walls 40cm high. If the snail manages to move 4cm up a wall each day,

but slips 3cm each night, how long does it take the snail to reach the top of the trough?
it then continues over the wall and makes it's way down to the ground outside. how long does it take to get there?

2 answers

37 days
The snail goes up 4cm but goes down 3cm every day but if the snail go up to 36cm, it’s going to be 36 days and it goes up 1 again. The next day it’s 37 cm. Then the snail will go up 4cm and it’s going to be 41cm. So it is going to be 37 days.