What is the centre of gravity?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

What has to be broken before you can use it?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

A Car is crossing a bridge 2 miles long. The bridge can only hold 10000 lbs, which is the exact weight of the car. The Car makes it half way across the bridge and stops. A bird lands on the car. Does the bridge collapse? Explain.

Why is it very easy to weigh a fish?

How many sides does a circle have?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?