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

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

If eleven plus two equals one, what does nine plus five equal?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

What four weights can be used to balance from 1 to 30 pounds?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

What does this Rebus Picture means ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

Find the missing value of "?" in the letter sequence below.

CAD
EBG
KBM
OCR
DDH
NL?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.