Which alphabet letter is a question?

Find the number of squares in the below picture

Can you solve the below tricky visual equation?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

What famous saying does this rebus mean?

COME SERVED <---
COME SERVED
COME SERVED
COME SERVED
COME SERVED

How could a baby fall out of a twenty-story building onto the ground and live?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain