There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

What word is pronounced the same if you take away four of its five letters?

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

What happened when the wheel was invented?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?