2026年8月国际B卷 · 第 4 题

2026年8月国际B卷 · 原库模块 2 · Q4 参考答案

The figure shows a rectangular pool surrounded by a concrete path that is x feet (ft) wide on all sides. The pool is 21 ft long and 11 ft wide. The area of the concrete path is 144 ft². What is the value of x?