Take away the whole and some still remain. What is it?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

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 ?

I have branches, but no fruit, trunk or leaves. What am I?

I have teeth but i don't bite. Who Am I ?

Solve this riddle by finding the odd one out from the rest.

What does this rebus means ?

What is the largest number you can write with just 3 digits?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

using four eights (8) and a one (1) and one mathematical symbol , create the number 100