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\( \frac{n}{2}+\frac{n}{3}+\frac{n}{5}=31 \) |
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Answer» \(\frac n2 + \frac n3 + \frac n5 = 31\) ⇒ \(\frac {15n + 10n + 6n}{30} = 31\) ⇒ \(\frac{31n}{30} = 31\) ⇒ \(n = 30\) |
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