Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Find the last number in the series below:

voN luJ yaM raM ---

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?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Solve the counting riddle by identifying the number of triangles in the given picture.

Count the number of squares in the picture below.

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 number divided by 4 is the same as that number minus 4?

John was piloting a plane behind a car but was never able to overtake it. Why?