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

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

Why did Buffon take the goal with him after every Juventus match?

I add 5 to 9 and get 2. The answer is correct, so what am I?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Which five letter word can be added at the end of below word to form a
valid word?

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If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?