2 puzzles from Claude Gaspard Bachet de Méziriac, each explained in a minute and credited to the original work. Free on Savvy.
You have a two-pan balance scale and may place weights on either side. What is the smallest set of four whole-number weights that lets you balance any integer weight from 1 to 40 a…
— Claude Gaspard Bachet de Méziriac, Problèmes plaisants et délectables qui se font par les nombres
You have three unmarked jugs holding 5, 11 and 13 ounces, and a container with 24 ounces of liquid. Using only these jugs to pour liquid between them, can you divide the 24 ounces …
— Claude Gaspard Bachet de Méziriac, Problèmes plaisants et délectables qui se font par les nombres