Which number should replace the question mark?

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

Can you count the number of matches in the picture below ?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Spot what is wrong here in below Picture?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

Can you place three balls such that the equation shown in the picture holds true?

John bought a new car. He has a habit of eating ice cream from a particular ice cream shop while returning home from office. Whenever, he eats strawberry ice cream, he faces no problem. But whenever, he eats chocolate ice cream, the car starts giving problem. At first, he thinks, it is just a co-incidence but when this awkward incident happens for 3-4 times, he reports this problem to the company.

The mechanic of the company checks but finds no problem at all. The next day, when he stops by to eat chocolate ice cream, the car again starts giving problem.

Can you find the possible reason?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?