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Vandaag is het 12 December 2018

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# Eiffel tower - science puzzle

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 The Eiffel tower in Paris has including the tv antenna an height of 321 meter. It is made out of 7 million kg steel. Somebody would like to build a scale model of this tower with a weight of 1 kg. How tall will this scale model be?

# Find the differences - logic puzzle

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 Move your head somewhat away from the monitor and answer the following question: what is the difference between the left and the right figure?

# Grandfather's birthday - math puzzle

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More than twenty years ago, Tim asked his grandfather who was celebrating his birthday that day: "How old are you now?" Grandfather smiled and said: "Add the digits of my year of birth and multiply the answer by 4." Tim would have looked so uncomfortable that his Grandfather immediately added, "By the way, this trick also works with the year we have on the calendar now." What was grandfathers age?

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