2026年9月国际B卷 · 第 21 题

2026年9月国际B卷 · 原库模块 1 · Q21 参考答案

The line models the possible combinations of the number of small shelves, x, and the number of large shelves, y, assembled by a worker in 720 minutes. It takes the worker a fixed amount of time to assemble each small shelf and a different fixed amount of time to assemble each large shelf. How long, in minutes, does it take the worker to assemble each large shelf?