The simplest form of 21 over 42 is 21/42 = 1/2
28 over 42 in simplest form is 2/3
42/189 in simplest form is 2/9
2/21
38/42 you can divide both 38 and 42 by 2 and the simplest form would be 19/42
42/2 = 21/1 = 21
42/63 = 2/3
42/63 = 2/3
42/189= 2/9
It is: 2/7
the answer is 2/5
2/5