Replace the question mark with the correct number in the below-given picture?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

Decode below rebus
D
N
A
T
S , D

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

I am a word of 12 alphabets.

* Alphabets 12, 4, 7, 2, 5 : Eastern beast of burden
* Alphabets 1, 8, 10, 9 are street made famous by Sinclair Lewis.
* Alphabets 11, 3, 6 are past.

On whole it means a person suffering from delusions of greatness.

What Is it ?

How many triangles can you count in the figure given?

what does the below math rebus puzzle mean?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?