Tennis Balls & PlanetsMath brain teasers require computations to solve.
A fool wants to tie a rope around the earth. So he buys a rope of 40,000 KM and ties it around the world. His neighbour, also a fool, wants to do the same only he wants the rope on sticks 1 meter above the ground.
How much more rope does he need? And how much more rope do you need when you use a tennis ball instead of the earth? 
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