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

Question 1

Andres earns £2,305 a month. Her boss tells her she will get a 56% pay rise. What is her new monthly gross pay?

Question 2

If you earn $1 in 10 minutes, how much will you earn in 4 hours?

Question 3

How many centimeters is one inch: 1.88, 2.12, 2.54 or 2.79?

Question 4

Used widely in timekeeping for its accuracy is what mineral?

Question 5

2694+1800+906 equals what number?

Question 6

Who sang the famous song Midnight Blues (unplugged) (1994)?

Question 7

Which formula represents 154 less than or equal to x?

Question 8

How was the German fighter Manfred von Richtofen better known?

Question 9

Approximately how many deciliters can one cubic foot hold: 237, 283, 342 or 411?

Question 10

Petrol costs $2.75 per litre. How much does it cost to fill up your car if it has a 30 litre tank?