
problem
Fence it
If you have only 40 metres of fencing available, what is the maximum area of land you can fence off?
Four friends must cross a bridge. How can they all cross it in just 17 minutes?
Manufacturers need to minimise the amount of material used to make their product. What is the best cross-section for a gutter?
What is the greatest volume you can get for a rectangular (cuboid) parcel if the maximum combined length and girth are 2 metres?