9/12 = 15/20
4/9 = 20/n 4n = 9(20) 4n = 180 n = 45
3 + 9 = 12
n + 1/4 = 9/20 n + 5/20 = 9/20 n = 4/20 = 1/5
15 - n when n equals 9 = 6
6n -3=2n+9 6n-2n=9+3 4n=12 n=12/4 n=3
n =33
7*n-n 7*2-2=12 9*2-2=16
(N/8)=(12/16) N= (12*8/16) N=6
12
3n = 15 + 12 = 27, 27/3 = 9 = n
12=n in a d
-12n - 9 = 77 Therefore, -12n = 77+9 = 86 Therefore, n = 86/-12 n = 7.16 recurring (that is, 7.16666..)