What is the Surname of Barbie Doll?

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?

How can you leave a room with two legs and return with six legs?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

What's a single-digit number with no value?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

What is the next number in this matchsticks series riddle?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?