数学题：一批工人到甲乙两个工地进行清理工作，甲工地的工作量是乙工地的工作量1.5倍，上午去甲工地的人数是去乙工地人数的3倍，下午这批工人中有十二分之五的人去乙工地，到下班时，甲工地的工作已经完成，乙工地的工作还需要4名工人再做1天，那么这批工人共有多少人？

数学题解答：

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