Question

Find the value of: n, if n /2 - 3n /4 + 5n /6 =21​

Answer 1

Step-by-step explanation:

$\frac{n}{2} - \frac{3n}{4} + \frac{5n}{6} = 21 \\ \frac{6n - 9n + 10n}{12} = 21 \\ \frac{7n}{12} = 21 \\ 7n = 21 \times 12 \\ 7n = 252 \\ n = \frac{252}{7} \\ n = 36$