1.

\( \frac{n}{2}+\frac{n}{3}+\frac{n}{5}=31 \)

Answer»

\(\frac n2 + \frac n3 + \frac n5 = 31\)

⇒ \(\frac {15n + 10n + 6n}{30} = 31\)

⇒ \(\frac{31n}{30} = 31\)

⇒ \(n = 30\)



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