what does the below math rebus puzzle mean?

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 ?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

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?

Can you make a six-letter word using the letters N, A and B ?

Can you identify if it's a murder or a suicide ?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

What is the difference between a jeweller and a jailer?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?