Replace the question mark with the number below given a simple math problem.

What is the centre of gravity?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

What does this rebus puzzle mean?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

Can you count the number of squares in the given picture?

There are three cows, two dogs, and one cat: How many legs do you have?

What goes up but never comes down?

Which is Odd One Out and why?

4377

3954

9862

8454

9831