Replace the question mark with the correct number in below Picture:

Why do we preferably have round manhole covers and not square ones?

Can you replace the question mark with the correct number?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

What does a man do only once in his lifetime, but women do once a year after they are 29?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

Can you tell a 3D object that has just two surfaces?

Who is that with a neck and no head, two arms and no hands? What is it?

What does an Island and the letter T have in common?