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?

Take one out and scratch my head, I am now black but once was red. What am I?

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

Why 1729 is a magic number? Answer Logically.

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

Can you decipher the below rebus?

PBLUESAISNUERSES

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What is red and smells like blue paint?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?