what does the below math rebus puzzle mean?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

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?

Imagine you are in a room with no windows or doors. How will you get out?

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Replace the question mark with the correct number in the below-given picture?

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

What is black when you buy it, red when you use it, and gray when you throw it away?

Name a key which is hardest to turn.