Mathematics
Junior High
答案是12，求詳解🙏
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10.若一項工程全程由甲施作,20天可完工;同一工程改由乙施作,則需要30天。現在由甲先作。
中途由乙接手完成剩下的工程,已知總共花了24天才完工,則甲作了1612天才由乙接手。
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