You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

If 21x = 79x, what is the value of x?

I can write cow in 13 letters.

Can You?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

What is the word or phrase?

Before Mount Everest was discovered, what was the highest mountain in the world?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

What has one letter and starts with an E?

What month of the year has 28 days?