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

? : 3839 :: 11 : 1209

What does this rebus mean?

O
N
C
E
TIME

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

Two old friends, Jack and Bill, meet after a long time.

Three kids
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?

Which city is three-fifths chick two third cat and 50% goat?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

Can you find out the remainder when 3^300 is divided by 5?

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

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?