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Intermediate

Pulling the strings

Two rods of length x and y are connected by two strings with a knot exactly halfway. The rods are placed parallel both with uncrossed and crossed strings. The distance between the knots is measured as a and b respectively. Express x and y in terms of a and b.

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Solution

The length x=a-b and y=a+b.

Solution by Quantum ( ? = ! ).
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