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

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

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?

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

When can we add 2 to 11 and get 1 as the correct answer?

Can you find out the total number of triangles in the given figure?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

John is the son of Jacob.
So,
Jacob is the_____of John's father?