A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

What is the centre of gravity?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

What can you hold in your right hand, but never in your left hand?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Solve the puzzle by telling what does below picture means.

The centre of the third figure is empty. What digit should fit inside?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?