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

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Eight of us go fourth, not back, to protect our king from an attack. What are we?

A guard is positioned at the one side of the bridge saying ‘A’. His task is to shoot all those who try to leave from ‘A’ to the other side and say ‘B’. He also need to welcome the person who comes from another side ‘B’ to his side ‘A’. The guard comes out of his post every 1 hour and looks down the bridge for any people trying to leave. You are at side ‘A’ and wish to go to another side ‘B’. you also know that it would take 1:45 hr to cross the bridge. How will you cross the bridge?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

What is the next number in this series?

4,12,84,3612....

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?