You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
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You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

If your uncle’s sister is not your aunt, what relation is she to you?

Can you find the missing piece of the Porsche?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

What is always in front of you but can’t be seen?