题库搜索>问题求解PS-13719
According to a survey, 93 percent of teenagers have used a computer to play games, 89 percent have used a computer to write reports, and 5 percent have not used a computer for either of these purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?
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画俩有重叠的圈 一个93 一个89 中间重叠部分未知
题目已知两部分总和为100-5=95 但是93+89两个圈的面积应该加了两遍重叠部分的阴影面积 所以用（93+89） - 95 = 87 就是剩下一个阴影的面积 也就是重叠的面积
ShawnLi
Total=G+W-BOTH+NONE=1 93+89+5-both=1 Both =1-187%=87%
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2018-12-23 18:46:51
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