Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

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?

It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct ten-digit numbers.

But do you know how many of these numbers are prime?

What does this rebus mean?

O
N
C
E
TIME

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

Why did Buffon take the goal with him after every Juventus match?

Make a sentence consisting of three words that have the whole alphabet.

If eleven plus two equals one, what does nine plus five equal?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?