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

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

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?

Can you name four days which start with the letter 'T'?

What can jump higher than a building?

What does this rebus puzzle means ?

Solve the counting riddle by identifying the number of triangles in the given picture.

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

What is the fastest way to double your money?

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???