What does the below rebus riddle means?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

I am quite hot but become too cold if you remove the first two letters. What am I?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

What is always in front of you but can’t be seen?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

Which is the correct shadow of the bird?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?