Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Can you start the fire using two pieces of wood?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

What 5-letter word typed in all capital letters can be read the same upside down?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Why 1729 is a magic number? Answer Logically.

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 ?

What number do you get when you multiply all of the numbers on a telephone's number pad?