A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

The more of this there is, the less you see. What is it?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

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

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

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

A girl was standing near the window thinking something. All of a sudden she decides something and throws something out of the window. She dies very soon after throwing it. She was perfectly healthy and had no disease or allergy. No one killed her and she did not commit suicide.

Can you think of any possible explanation that is logical as well for what happened there?