What begins with T, ends with T, and has T in it?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Prove that twice of ten is the same as twice of eleven.

Which alphabet is a part of our body?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Which five letter word can be added at the end of below word to form a
valid word?

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While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?

What Adam and Eve do not have but the rest of the people have?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?