In an education institution, 55% students have Facebook, 35% have Twitter and 20% have both. What percent of students do not have any?
Solution
Correct Answer: Option C
All = Single + None - Both
⇒ 100 = 55 + 35 + none - 20
⇒ 100 = 70 + none
∴ none = 30
⇒ 100 = 55 + 35 + none - 20
⇒ 100 = 70 + none
∴ none = 30
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