If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

I make two people out of one. What am I?

What is black when you buy it, red when you use it, and gray when you throw it away?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

What number should come in place of the question mark below?

Can you decipher the below rebus?

PBLUESAISNUERSES

What do you see in the image below