Which number should replace the question mark?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

What breaks yet never falls, and what falls yet never breaks?

Two men are in a desert. They both have packs on. One of the guys is dead. The guy alive has his pack open, and the guy who is dead has his pack closed. What is in the pack?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

People make me, save me, change me, raise me. What am I?

When is the top of a mountain similar to a savings account?

What does this rebus picture identify?

There is something which you can be arrested for attempting but not for successfully completing.

Can you count the number of triangles in the picture below?