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?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

You see me once in June, twice in November, and not at all in May. What am I?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

What do you call a fish without an eye?

What runs around the whole yard without moving?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?