2025年3月美国A卷 · 第 16 题

2025年3月美国A卷 · 原库模块 2 · Q16 原库参考解析

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 13 ft wide. The area of the concrete path is 240 ft² . What is the value of x?