All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

Can it be possible to build a house that has all its four walls facing towards the South?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Can you decipher the below rebus?

PBLUESAISNUERSES

Imagine you are in a room with no windows or doors. How will you get out?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

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

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?