Can you replace the question mark with the correct number?

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

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

81 x 9 = 801. What must you do to make the this equation true?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

What is harder to catch the faster you run?

It's been the first day of the school when a young girl was found raped and murdered.
Police suspect four male teachers as on the killers and ask them what they were doing in the morning in time 8:00 am.
1. Wayne: I was reading the newspaper.
2. Terry: I was checking chemistry papers
3. Bridge: I had locked myself in my room as my wife left me.
4. Cole: I dropped my wife to her office.

Who is the killer?

In the given picture, you can find a square in the centre and four open squares. Can you form three closed squares by just moving three sticks from their positions respectively?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?