Find the next number in the sequence

5 12 24 36 ?

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)?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

Why is the Hole below a Lock?

Which digit occurred maximum times between the number 1 and 1000?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

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

Using eight eights and addition only, can you make 1000?