What does this simple rebus mean?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

What jumps when it walks and sits when it stands?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

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

I cannot talk, but I always reply when spoken to. What am I?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?