Which tank will fill first?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

What Time Should the last watch show in the below figure?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

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

Can you decipher the two rows to find the hidden word?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

What has lots of eyes, but can’t see?