I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

No matter how little or how much you use me, you change me every month. What am I?

When we see 2 but call 10?

Why do you find that most of the buildings are deprived of the 13th floor?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

Why is the Hole below a Lock?

Replace the question mark in the picture below.

What 5-letter word typed in all capital letters can be read the same upside down?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.