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

What does this say?

XLR8

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What do you get if you add 2 to 100 four times?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

What goes up but never comes down?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Why Aeroplane windows are round?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT