Question

solve n /2 -3n//4+5n/6=21​

Answer 1

Given,

$given\\ \\ \frac{n}{2} - \frac{3n}{4} + \frac{5 \:n}{6} = 21 \\ \\ l.c.m \: of \: 2 \: 4 \: 6 \: is \: 12 \\ \\ \frac{ 6n - 9n + 10n}{12} = 21 \\ \\ = > 7n - 21 \times 12 \\ = > n = 36$

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