What does below rebus means ?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

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?

Can you solve below mathematical equation?

2^1234 - 2^1233

What does this simple rebus mean?

Which flower has two lips?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

I’m orange, I wear a green hat and I sound like a parrot. What am I?