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.

What English word has three consecutive double letters?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

The cream is heavier than Milk. True or False?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?