1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

What does a man do only once in his lifetime, but women do once a year after they are 29?

How many triangles can you count in the figure given?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

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.

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'