SparksMaths | Utilities problem - Solved! @SparksMaths | Uploaded 8 years ago | Updated 1 hour ago
The utilities problem is a mathematical classic - en.wikipedia.org/wiki/Three_utilities_problem

It's impossible to solve it on a flat surface (a plane).

However, it is possible on topologically different surfaces - in this case a torus ('doughnut').

Ballon from MathsGear.co.uk (http://mathsgear.co.uk/collections/shapes/products/torus-balloons)