What will you call your mother's brother's brother-in-law?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

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.

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

Using Only Five 5's and any mathematical operator make sum as 37

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

How many Watermelons are there in the below picture?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.