What is the fastest way to double your money?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

What does this below rebus puzzle mean?

I have an eye but still cannot see.

Who am I?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What number do you get when you multiply all of the numbers on a telephone's number pad?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

The Little ant seems to be always confused. Do you know why?