Can you solve the "Hanging Cable" problem, used as an Amazon interview question?

A cable of 80 meters is hanging from the top of two poles that are both 50 meters off the ground. What is the distance between the two poles (to one decimal point) if the center cable is (a) 20 meters off the ground and (b) 10 meters off the ground?

Presh Talwalker of Mind Your Decisions says the above riddle was used as an Amazon interview question. His video has the answer.

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Can you solve the wizard standoff riddle?

Math 4 Love founder Dan Finkel writes:

You’ve been chosen as a champion to represent your wizarding house in a deadly duel against two rival magic schools. Your opponents are a powerful sorcerer who wields a wand that can turn people into fish, and a powerful enchantress who wields a wand that turns people into statues. Can you choose a wand and devise a strategy that ensures you will win the duel?

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Can you solve the seven planets riddle?

Created by esteemed riddler Edwin F. Meyer, co-author of The Gedanken Institute Book of Puzzles.

(TED-Ed)

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