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【OG20-P281-327题】
Jones has worked at Firm X twice as many years as Green, and Green has worked at Firm X four years longer than Smith. How many years has Green worked at Firm X?1. Jones has worked at Firm X 9 years longer than Smith.2. Green has worked at Firm X 5 years less than Jones.
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分析A选项
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分析B选项
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分析C选项
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分析D选项
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分析E选项
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当前版本由
锦鲤哥Lucas 更新于2020-09-22 15:42:27 感谢由
锦鲤哥Lucas 对此题目的解答所做出的贡献。
D
【知识点】twice as many a as b的意思是a=2b
【解析】
假设Jones，Green，Smith工作年份分别是J,G,S，已知J=2G,G=S+4，求G
条件1：J=S+9，解得G=5，充分
条件2：J-5=G，解得G=5，充分
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