Oxford ranks as one of the best universities in the world. Can you solve this ladder problem, which is adapted from an admission interview question?

Source
http://www.ox.ac.uk/admissions..../undergraduate/apply

Desmos animation
https://www.desmos.com/calculator/86hptwtqwb

Websites consulted in research
http://wordplay.blogs.nytimes.....com/2012/09/17/numbe
http://mathematicsbhilai.blogs....pot.com/2015/12/locu
http://www.mathematische-basteleien.de/ladder.htm
https://www.geogebra.org/m/ZUAcBme2
https://www.youtube.com/watch?v=YIgjYgvuQ8o

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