I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Replace the question mark in the picture below.

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Can you find out the missing number in the grid?

How many triangles can you find in this given picture?

A game is being played where eight players can last for thirty-five minutes. Six substitutes alternate with each player in this game. Thus, all players are on the pitch for the same amount of time including the substitutes.

For how long is each player on the pitch?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

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