In a school, two-fifth of the students own a mobile phone, four-fifth own a laptop, and 20% own both. What percentage of students own only one of the two (either a mobile phone or a laptop)?
Solution
Let us assume total students in school = 100%
two-fifth of the students own a mobile phone = 2/5*100 = 40% have mobile phone
four-fifth own a laptop = 4/5*100 = 80% have laptops
20% own both.
So, students with only mobile = 40%-20% = 20%
Students with only laptop = 80%-20% = 60%
Hence, the percentage of students who own only one of the two (either a mobile phone or a laptop) = 20+60 = 80%
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