如何用代数解决这个问题？

youdontknowme

Manhattan里有一题，通过他们建议的方式似乎非常简单。可是如果用代数方式如何解决呢？就是带入xyz。请大虾指教

A researcher estimates that 10% of the children in the world are between the ages of 8~18 and dislike soccer, and that 50% of the children who like soccer are between the ages of 8 and 18. If 40% of the children in the worlds are between the ages of 8~18, what percentage of children in the world are under age 8 and dislike the game of soccer? (All children are between the ages of 0~18)

youdontknowme

是啊，那就是书的方式。可是如果使用代数解法如何做呢？

emmahiggins09

楼主画个韦恩表格不就行了么， 横向 like, dislike, total ；纵向 8-18 , 小于8 , total