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Yes, 18/42 = 9/21
30 over 42 can be reduced to 5/7
6 over 18 is reduced to 1/3
42/84 = 1/2
21/42 = 1/2
It is: 4/18 = 2/9 reduced
7/3
18/42 = 9/21 = 3/7
18 over 38 reduced = 9/19
12/42 = 2/7
18/70 can be reduced to 9/35.
6/18 can be reduced to 1/3
18/42 = 3/7