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High voltage pylons

A wire with a length of 60 meter is hanging between two high voltage pylons. The wire is connected to the pylons at a height of 50 meters. The middle part of the wire is 20 meters above ground level. How far are the high voltage pylons standing apart? high voltage pylon

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Letter folding

If you would fold a letter in two fifty times, how thick should the enveloppe be that can fit the letter? Assume that the thickness of a piece of paper is about 0.05 mm.

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Number magic

If you multiply me by 2, subtract 1, and read the reverse the result you'll find me. Which numbers can I be?

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