When can we add 2 to 11 and get 1 as the correct answer?

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?

People put me on the table and cut me but do not eat me. What am I?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

Find the missing number in the image below.

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

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

Detective Rockford was jogging near the beach at 4:30 am.
He hears a sound near the shack "No Michael, Please Do not shoot me".
Next instance he heard the sound of gunfire. Rockford rushes to the shack where he finds women lying dead and a gun in close proximity of three "Doctore Lawyer and a Teacher".

Rockford immediately knew that the Lawyer has committed the crime. How?