Identify the hidden meaning behind this picture?

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

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

If 21x = 79x, what is the value of x?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

Can you find out who is the kidnapper in below Picture and why, Explain ?

I make two people out of one. What am I?

I always drive my customer away.

Who am I?