Find the next number in the sequence

5 12 24 36 ?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

If an electric train is travelling south, then which way is the smoke going?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

If you say my name, I will no longer exist. What am I?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Can you count the number of triangles inside a triangle?