What two things can you never eat for breakfast?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

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?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

Can you move 2 matchsticks to form four equal sized squares.

Replace the question mark in the picture below.

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

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