Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

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

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

Find the value of "?" in the ball picture Riddle below:

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

Why is a river so rich ?