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?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Our product and our sum always give the same answer. Who are we?

Identify the hidden meaning behind this picture?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Prove that twice of ten is the same as twice of eleven.

The more you take me, the more you leave me behind.
Who Am I?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?