What does this mathematical rebus means ?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

What is the next number in this series?

4,12,84,3612....

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

Prove that twice of ten is the same as twice of eleven.

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Which of the below owl is odd one out?