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In a group of 140 students, 65 use Craigslist, 85 use eBay, and 20 use neither. A) how many students use both websites?

User Tanasha
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\begin{gathered} 140\to\text{ students} \\ 20\to\text{ no use neither website} \\ 140-20=\text{ 120 students that uses websites} \\ 65+85=150\text{ studentes that uses Craigslist ans eBay} \\ 150-120\text{ = 30 students that uses both } \end{gathered}

User El Padrino
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