What number comes next in the series?

5 15 5 18 5 24 14 20 _

I’m tall when I’m young, and I’m short when I’m old. What am I?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

It is always ahead of me yet I can never see it. What is it?

what does the below math rebus puzzle mean?

Find the next number in the series

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

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

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