Bluebook试题7 · 第 1 题

Bluebook试题7 · 原库模块 2 · Q1 原库参考解析

A total of 165 people contributed to a charity event as either a donor or a volunteer. 130 people contributed as a donor. How many people contributed as a volunteer?

Bluebook试题7 · 第 1 题

解题思路

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