What is the Surname of Barbie Doll?

What does this below rebus puzzle mean?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

What is common among 11, 69, and 88?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?