You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

If eleven plus two equals one, what does nine plus five equal?

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

What's the only room from which no one can enter or leave

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

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?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

I know a nine-letter word having only one vowel.
Do you ?