It’s 18 to 5 (Official clock system).

04:42

It’s 18 to 5.

Correct answer

04:41

It’s 19 to 5.

Error: 1 minute earlier

03:50

It’s 10 to 4.

Error: read minutes starting from hour markings and adding minutes

08:20

It’s 20 past 8.

Error: confuse hour and minute hands