Question

n/2 - 3n/4 + 5n/6 =21

Answer 1

taking the lcm of 2,4,6
we get
n×6/2×6 - 3n×3/4×3 + 5n×2/6×2 = 21
6n-9n+10n/12 =21
7n/12 = 21
n = 21×12/7
n = 3×12=36
Hope this helps

Answer 2

Answer:

36

Step-by-step explanation:

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

To Find : Value of n

Solution:

Tale LCM of 2 ,4 and 6

LCM =12

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

$\frac{6n-9n+10n}{12}=21$

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

$7n=21 \times 12$

$7n=252$

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

$n=36$

Hence the value of n is 36