What does the below image rebus riddle means ?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

Can you count the number of matches in the picture below ?

what does the below math rebus puzzle mean?