Question

pls solve it Thank you​

Answer 1

Answer:

n = 36

Step-by-step explanation:

$\frac{n}{2} - \frac{3n}{4} + \frac{5n}{6} = 21$

LCM of 2,4,6 is 12

multipliying on both sides by 12

=

$12 \times \frac{n}{2} - 12 \times \frac{3n}{4} + \frac{5n}{6} = 21 \times 12$

= 6n - 9n + 10n = 252

16n - 9n = 252

7n = 252

$n = \frac{252}{7}$

n = 36

Answer 2

ANSWER = 36

$\frac{n}{2} - \frac{3n}{4} + \frac{5n}{6} = \frac{21}{1}$

$\implies \: \frac{4n - 6n}{8} + \frac{5n}{6} = 21$

$\implies \: \frac{ - 2n}{8} + \frac{5n}{6} = 21$

$\implies \: \frac{ - 6n + 20n}{24} = 21$

$\implies \: \frac{14n}{24} = 21$

$\implies \: \frac{7n}{12} = 21$

$\implies \: n = \frac{21 \times 12}{7}$

$\implies \: n \: = 36$