Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Can you make a six-letter word using the letters N, A and B ?

Can you count the number of squares in the given picture?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Decode the below four famous ciphers:

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

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

Bay of Bengal is in which state?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?