An ant tries to climb the water pipe 10m high, it climb 2m up and slips back 1m down in every moves. In how many will it reach the top of the 10m high pipe.

Answer 1

The water pipes 10m high
It climb 2m up
and slips back 1m down in every moves.
8+2=10
• so the 9th move ant reach the top 10m water pipe high

Answer 2

At move #1, reaches 2 m, ends up at 1 m
At move #2, reaches 3 m, ends up at 2 m
At move #3, reaches 4 m, ends up at 3 m
....
At move #9, reaches 10 m

you are correct