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

Kohli and Dhoni decided to have a paintball match.
Kohli told Dhoni, "Sir it is not right as you got thrice the paintballs I have".

Dhoni instantly gives Kohli 10 hit paintballs.
Kohli replied, "Sir, I believe you still have twice the paintballs than I have".

Dhoni gives "?" more paintballs to Kohli.
Kohli replied, "Sir it is even now, Let us have a match".

What is "?".

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?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Which of the below owl is odd one out?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

Can you identify the famous TV character from the rebus below?

How do you go from 98 to 720 using just one letter?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?