If two's company, and three's a crowd, then whats four and five ?

What is next number in the pattern below:

131 517 192 123 ?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What is the last thing you take off before bed?

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Okay before we begin with the puzzle, do keep in mind that you have to answer it quickly.

You are participating in a car race. Seeking the perfect moment, you overtake the second person in the race. What positions are you in now?

A car is crossing a 20 km-long bridge. The bridge can support at most 1500kg of weight over it. If somehow, the weight on the bridge becomes more than that, it will break.

Now, the weight of the car is exactly 1500kg. At the midway, a bird comes and sits on the roof of the car. This bird weighs exactly 200 grams.
Can you tell if the bridge breaks at this point or not?

How many letters are in the alphabet?

I cannot talk, but I always reply when spoken to. What am I?