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

If 21x = 79x, what is the value of x?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct ten-digit numbers.

But do you know how many of these numbers are prime?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

Kids with the most attentive eyes can spot a different watermelon in 4 seconds. Can you? Test your eyes now!