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

What is black when you buy it, red when you use it, and gray when you throw it away?

What has to be broken before you can use it?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

What building has the most stories?