yoyo0123 yoyo0123 03-05-2020 Mathematics contestada Rewrite the proportion 7:21 = 3:9 as a proportion using fractions. O A) 7/21 = 3/9 OB) 7/21 = 9/3 OC) 21/7 = 3/9 OD) 7/9 = 3/21