It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

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?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

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

What Am I?

If an electric train is travelling south, then which way is the smoke going?

Can you find out the remainder when 3^300 is divided by 5?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?