Before Mount Everest was discovered, what was the highest mountain in the world?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

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

A man dies of old age on his 25 birthday. How is this possible?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

No one wants to have it, but if one got it, he does not want to lose it. What is It?

Can you find out the total number of triangles in the given figure?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

If six children and two dogs were under an umbrella, how come none of them got wet?

What is harder to catch the faster you run?