Question 164

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

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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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