alfretztay Post on Sat, 14/10/2017 2:11pm 1 – 1/3 = 2/3 = 10/15 ( chocolate eaten) 1 – 2/7 = 5/7 = 10/14 (blueberry eaten) (10 + 10)/(15 + 14) = 20/29 Ans : 20/29.