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英语翻译In a creative-writing course,60 students chose from amon

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英语翻译
In a creative-writing course,60 students chose from among 5 genres for each assignment.The graph above shows the distribution of the stories turned in for one assignment.If there were 6 assignments during the semester,and the same number of students turned in Detective Stories for each assignment,what is the total number of Detective stories turned in during the semester.
如果图看不清的话..
Detective:20% Action-adventure:30% Mystery:25% Western:10% Horror:15%
在写作课上,60个学生需在5个题材中选一个来创作.上述图表显示了故事题材分配的比例.如果一个学期有6堂这样的课,而且每次交侦探故事的同学数量都相等,问:在这个学期内总共有多少篇侦探故事?
60×20%×6=72篇