What four weights can be used to balance from 1 to 30 pounds?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you decipher the below rebus?

PBLUESAISNUERSES

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

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.

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?