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 type of curtain does this rebus mean

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

Name a key which is hardest to turn.

Guess the hidden movie name?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?