Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

What's the only room from which no one can enter or leave

Joseph buys three kinds of chocolates for 100 rupees. The first one is priced at 5 rupees, second one at 3 rupees and third one at 0.5 rupees.

If he bought 100 chocolates in total, how many pieces do you think he bought each chocolate?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

When can we add 2 to 11 and get 1 as the correct answer?

A father's child, a mother's child, yet no one's son.

Who am I?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

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