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3. George and Alex were asked to solve the following problem. 400 students in a junior high school participated in a survey. It was found

3. George and Alex were asked to solve the following problem. 400 students in a junior high school participated in a survey. It was found that 300 students have a smartphone, 160 students have a tablet, and 120 students have both a smartphone and a tablet. 


e) What percentage of students have neither a smartphone nor a tablet

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