Easy Work Cannot Do

The other day a simple task was pass on to the trainee to do it. It was changing the computer's IP Address. I will give example of the IP below

Current

IP - 10.10.10.3
SM - 255.255.255.0
GW - 10.10.10.1


To Change too

After
IP - 10.10.11.3
SM - 255.255.255.0
GW - 10.10.11.1

Simple task right? But guess what? When the trainee went there and change the IP, even simple task they cannot even do. They messed up even the most simple job. They even wrote down the things to change on a piece of paper. This is what they did

After

IP - 10.10.10.3 or 10.10.12.3
SM - 255.255.255.0
GW - 10.10.11.2 or 10.10.12.1

Since I know even the most simple task which was handed over to them they cannot do, I went there to do the task too. In the end I had to fix their mistakes. When coming back this is what my office mate say to me :

Friends : Eh you become programmer?
JT : No lar, have to fix the IP Address coz either the IP wrong of the gateway is wrong.

Actually 1 of my friend said that even though they are there or not there, it doesn't make any difference as they don't know anything and they only love to check out girls picture in facebook.