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Sets \(M\) and \(N\) contain exactly \(m\) and \(n\) elements, respectively. What is the value of \(n?\)

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Sets \(M\) and \(N\) contain exactly \(m\) and \(n\) elements, respectively. What is the value of \(n?\)

(1) \(7m=8n\)
(2) The intersection of \(M\) and \(N\) contains exactly \(0.4m\) elements.

Answer: E

Source: GMAT Prep
Source: — Data Sufficiency |