Answer:
16.2/8=2/n
n x 2=8 x 2
n x 2=16
n = 16/2
n=8
17. 3/n = 6/8
8 x 3 = n x 6
24 = n x 6
n x 6 = 24
n = 24/6
n= 4
18.n/6 =6/4
2n = 3 x 6
n=18
n=18/2
n=9
19.4/5 = n/20
4/5 x 20 = n
4 x 20/5 = n
80/5 = n
16 = n
n=16
20. 3/12 = 2/n
n x 3 = 12 x 2
n x 3 = 24
n=24/3
n=8
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