What is the coolest letter in the alphabet?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

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

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

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

What has 88 keys?

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

How will you reply to such a question?

Can you move 2 matchsticks to form four equal sized squares.

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

What does the below rebus riddle means?