Can you solve the below tricky visual equation?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

What happened when the wheel was invented?

Different lights make me strange by changing me into different sizes. What am I?

I look at you, you look at me, I raise my right, you raise your left. What am I?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

Can you start the fire using two pieces of wood?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Akbar summoned Birbal out of anger.
He told him that he will have to face death.
He asked him to make a statement and if the statement is true he will be buried alive and if the statement is false, he will be thrown at lions.
After hearing Birbal’s statement, Akbar could do nothing but smile.
He gave him 5 gold bars and let him go.

What did Birbal say?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?