During a mathematic class, the teacher ask, class who knows what 2+2 is?
realising how simple the question, johnny raises his hand, but the teacher pointed to another student. Johnny was .
the teacher ask agian,
who knows what
5+5 is? johnny raises his hand again, but the teacher still didn't point at him. The teacher asks his third question, johnny what's x if 40x + 30x = 120?
johnny replies, but sir, i didn't raise up my hand.