Problem: What metal, safely used in food colouring, has the E-Number 175?
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A: gold

Problem: The battles of Lutzen 1632 and Rocroi 1643, were fought during which war?
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A: thirty years war

Problem: What Incan city's ruins were unknown to the outside world until 1911?
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A: machu picchu

Problem: How many squares are on a Spear's Games Snakes and Ladders board?
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A:
100