what does this picture(rebus) riddle means ?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

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

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Out of the nine cats that you can see in the picture, there are only two that are completely identical. Can you find them out?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?