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Extremely hard mixed knowledge quiz, how many did you answer correctly?

Question 1

4 x 4 x 5 x 5 = ?

Question 2

A circle above 2 other circles is the lower 2 circles multiplied. Which of these numbers will therefore be in the top most circle?

Question 3

Who sang the famous song "Shoo-Bee-Doo-Be-Doo-Da-Day" (1968)?

Question 4

Which of the following philosophers spent their entire career at Harvard?

Question 5

Which formula represents 342 less than x?

Question 6

Who sang the famous song Lazy Sunday Afternoon (1995)?

Question 7

Who sang the famous song Toulouse Street (1972)?

Question 8

What is the name of the official record book or diary of a ship or boat?

Question 9

Who sang the famous song "You Showed Me" (1969)?

Question 10

4545+3034+1523 equals what number?