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

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Two natural numbers have a sum of less than 100 and are greater than one.

John knows the product of the numbers and Jacob knows the sum of numbers.

The following conversation takes place between them:
John: 'I am not aware of those numbers.'
Jacob: 'I knew you wouldn't be. I am not aware myself.'
John: 'Now I know them!'
Jacob: 'Now I know them, too!'

What are the two numbers?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What has no start, end, or centre?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

What do you think with the below Picture ?