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?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

What do you see in the image below

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

You can see it everyday, But cannot touch it at will. What is it?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?