Move four matchsticks to the below square to form three squares?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

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?

What is the next number in the series?

15 29 56 108 208 ?

We have two identical balls in terms of diameter and weight. However, one of them is solid and the other is hollow.

Without knocking the ball, can you find the solid ball?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

It belongs to you, but other people use it more than you do. What is it?

What do you answer even though it never asks you questions?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.