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Scroll down for the answer to the facebook riddle/puzzle

Challenging Knowledge Quiz
Question 1 of 10
Which country invented paper?
Question 2 of 10
What is the most widely spoken language in the world by total number of speakers?
Question 3 of 10
What is the capital of Argentina?
Question 4 of 10
Which gas is most commonly used in lightbulbs?
Question 5 of 10
Which continent has the most countries?
Question 6 of 10
Who painted the famous work *Guernica*?
Question 7 of 10
What is the currency of Switzerland?
Question 8 of 10
What part of the plant conducts photosynthesis?
Question 9 of 10
Which famous scientist was born in Pisa in 1564?
Question 10 of 10
How many players are there on a standard soccer team (on the field)?

Answer riddle/puzzle:

x=30°