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ZX-7F8EA57E5CSystems of two linear equations in two variables · 第 4 题
Systems of two linear equations in two variables · 原库模块 1 · Q4 原库参考解析
During a month, Morgan ran r miles at 5 miles per hour and biked b miles at 10 miles per hour. She ran and biked a total of 200 miles that month, and she biked for twice as many hours as she ran. What is the total number of miles that Morgan biked during the month?
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