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

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

No matter how little or how much you use me, you change me every month. What am I?

If,

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

Then

4 / 5 = ?

What has 13 hearts but no other organs?

Find the next number in the sequence

5 12 24 36 ?