2 puzzles from Sun Zi, each explained in a minute and credited to the original work. Free on Savvy.
A pile of objects is counted out in groups. Counted three at a time, two are left over. Counted five at a time, three are left over. Counted seven at a time, two are left over. Wha…
— Sun Zi (attributed; exact identity unknown), Sunzi Suanjing (The Mathematical Classic of Sun Zi)
A cage holds nothing but pheasants and rabbits. Counting heads from above gives 35. Counting feet from below gives 94. How many pheasants and how many rabbits are in the cage?
— Sun Zi (attributed; exact identity unknown), Sunzi Suanjing (The Mathematical Classic of Sun Zi)