Brain Teaser's / Riddels. Number 6

1] How many times can you subtract the number 5 from 25?
      Pick the tomato, get the answer!

2] Which is correct to say, the yolk of the egg are white, or the yolk of the egg is white?    

1] Only once. After that you would be subtracting 5 from 20, 15, and so on

2] Neither. The yolk of the egg is YELLOW!