There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Can you make four (4) nines (9) equal 100?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?