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.

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I have feet, but no legs. Which animal Am I?

Can you replace the question mark with the correct number?

By using 'because' continuously three times, can you make an English statement ?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?