Replace the question mark with the number below given a simple math problem.

I shave every day, but my beard stays the same. What am I?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Who are the happiest people in IPL match?

What is the last thing you take off before bed?

What does the below rebus puzzle mean?

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?