If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Find the number of squares in the below-given picture.

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

What is the centre of gravity?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

What number do you get when you multiply all of the numbers on a telephone's number pad?