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

What is black when you buy it, red when you use it, and gray when you throw it away?

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

How Come ??

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Can you count the number of blocks in the picture below?

Can you replace the question mark with the correct number?

How many sides does a circle have?