修一条路长2316米,甲每天修30米,乙每天修42米,甲先修若干天再由乙修,一共修了60天.问个修多少米?
题目
修一条路长2316米,甲每天修30米,乙每天修42米,甲先修若干天再由乙修,一共修了60天.问个修多少米?
答案
30x+42y=2316
x+y=60
解得 x=17 y=43
举一反三
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