I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

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.

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

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.

Hint: The grid reads the same across as down.

Which tank will fill first?

Which is the rope you never skip with?

What runs around the whole yard without moving?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

You need to arrange three 7 and mathematical symbols to form number 1?