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

Question 1

Which US natural attraction is known also as the eighth wonder of the world?

Question 2

Who, in Britain, was known as The Third Man?

Question 3

879+590+301 equals what number?

Question 4

My electricity bill is £124 a quarter. The company announces prices will rise by 44%. How much will my annual bill be?

Question 5

If you earn $9 in 18 minutes, how much will you earn in 8 hours?

Question 6

86x87÷86 equals what number?

Question 7

Which became the 49th US state in January 1959?

Question 8

80x41+406 equals what number?

Question 9

Who sang the famous song Cod Liver Oil (2005)?

Question 10

What currency is used in many European countries?