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

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

Which part of London exists in France as well ?

Optical Illusion: People with hawk eyes can spot a different car in 5 seconds. Can you? Test your vision now!

Spot 5 differences in two Christmas tree below:

Can you find the number of triangles in the given figure?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

The richest man in the city Mr Rechard is kidnapped. James Bond is appointed to the case. At the crime scene, a note is found written by Mr Richard. The note read:

"First of January, Fourth of October, Fifth of March, Third of June."

James Bond knew that somehow, the killer's name was hidden in the note. The following were the suspects:

Jack Richard, the son and the heir of property.
John Jacobson, the employee of Richard.
June Richard, the wife of Richard.

James Bond took only a few moments to deduce the killer's name. Can you tell who was the killer?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??