How many times can you subtract the number two from the number fifty?

A guard is positioned at the one side of the bridge saying ‘A’. His task is to shoot all those who try to leave from ‘A’ to the other side and say ‘B’. He also need to welcome the person who comes from another side ‘B’ to his side ‘A’. The guard comes out of his post every 1 hour and looks down the bridge for any people trying to leave. You are at side ‘A’ and wish to go to another side ‘B’. you also know that it would take 1:45 hr to cross the bridge. How will you cross the bridge?

I don't get anymore wetter, no matter how much rain falls on me.

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

What building has the most stories?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

What am I?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

No one wants to have it, but if one got it, he does not want to lose it. What is It?