Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

I cannot talk, but I always reply when spoken to. What am I?

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

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

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?

A farmer and his neighbour once went to Emperor Akbar"s court with a complaint. "Your Majesty, I bought a well from him," said the farmer pointing to his neighbour, "and now he wants me to pay for the water."
"That"s right, your Majesty," said the neighbour. "I sold him the well but not the water!"?
The Emperor asked Birbal to settle the dispute. How did Birbal solve the dispute?

Which digit occurred maximum times between the number 1 and 1000?

What word begins and ends with an E, but has only one letter?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

Can you find out who is the kidnapper in below Picture and why, Explain ?