3 per 7+ 4 per 21 -13 pe 14 By Admin ReiPosted on December 2, 2022 3 per 7+ 4 per 21 -13 pe 14 3/7 + 7/4 – 13/14 = 12/28 + 49/28 – 26/28 = 61/28 – 26/28= 35/28