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Anonymous
Since 21 and 18 have the common factor of 3, reduce 'em to get:
21 to 18
= (3 * 7) to (3 * 6)
= 7 to 6
Wiki User
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7 to 25
18/21 in simplest form is 6/7.
39
21/54 = 7/18
21/91 = 3/13