What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

Which flower has two lips?

I am white when I am dirty, and black when I am clean. What am I?

Count the squares in the matchstick puzzle below?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

I cannot talk, but I always reply when spoken to. What am I?

What can you hold in your right hand, but never in your left hand?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

A man is approaching a broad and barren land. He has a package with him. If somehow, he is unable to open the package before reaching the land, he will die.

Can you guess what is present in the package?