How many sides does a circle have?

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

When is the top of a mountain similar to a savings account?

How many triangles can you find in this given picture?

That attorney is my brother, testified the accountant.

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

Who is lying?

What does this Rebus Picture means ?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Move four matchsticks to the below square to form three squares?