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

Can you replace the question mark with the correct number?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Different lights make me strange by changing me into different sizes. What am I?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

I am an odd number. Take away a letter and I become even. What number am I?

Who has married many women but was never married?