> "If a ship had 26 sheep and 10 goats onboard, how old is the ship's captain?"
What 'clue' did I miss? The only other information is some speculation from a Weibo commenter who thinks that 26 sheep + 10 goats = 7700kgs.
I supposed you could argue that these 5th grade students should know the minimum age required to have a commercial boat licence, but I couldn't tell you that answer for my country (and we don't know that this is a commercial ship, could just be someone taking his livestock for a jaunt around the lake).