What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

The dirtier I get, the whiter I look. Who am I?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?