The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

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

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

Why is a river so rich ?

Solve the rebus riddle in the picture below.

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?