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

How many triangles are there on the puzzle below?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

Out of the nine cats that you can see in the picture, there are only two that are completely identical. Can you find them out?

Rearrange the letters in "new door" to make one word.

What does this below rebus puzzle mean?

Mother's Name is Mrs. SIXTY TWO
Son's Name is FIFTY TWO
Daughter's Name is FORTY TWO
What is Name of Father?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?