What does below pictogram mean?

A father's child, a mother's child, yet no one's son.

Who am I?

What does this rebus means ?

PROG WORKRESS

Can you solve the maths in the below-given picture equation?

Solve the following series:
AZ, GT, MN, __, YB

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

What does below chemistry rebus means?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?