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

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

You have two jars of chocolates labelled as P and Q. If you move one chocolate from P to Q, the number of chocolates on B will become twice the number of chocolates in A. If you move one chocolate from Q to P, the number of chocolates in both the jars will become equal.

Can you find out how many chocolates are there in P and Q respectively?

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

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

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?

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

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

What always comes into a house through the keyhole?