what does the below rebus means?

What does this Rebus Picture mean?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

How many triangles can you count in the figure given?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

Why do we preferably have round manhole covers and not square ones?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?