John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Why is the Hole below a Lock?

You can hear me, but you can't touch or see me.

What am I?

How many times can you subtract the number 5 from 25?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Can you solve the photo plexer logic ?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

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?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?