Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

Can you identify the hidden rebus in the image below?

I am a word of 12 alphabets.

* Alphabets 12, 4, 7, 2, 5 : Eastern beast of burden
* Alphabets 1, 8, 10, 9 are street made famous by Sinclair Lewis.
* Alphabets 11, 3, 6 are past.

On whole it means a person suffering from delusions of greatness.

What Is it ?

Can you place six X (crosses) in below board without making three in a row in any way ?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

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.

Which tank will fill first?

Prove that twice of ten is the same as twice of eleven.

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?