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2/12 + 9/12=11/12 15/35 +14/35=29/35 7/4+11/5+16/10=35/20+44/20+52/20=131/20=6 11/20 9/4+13/8+7/16=36/16+26/16+7/16=69/16=69/16=4 4/16

b) 1/6 + 3/4 = 4/24 + 18/24 = 22/24 = 11/12 3/7 + 2/5 = 15/35 + 14/35 = 29/35 c) 1 3/4 + 2 1/5 + 1 6/10 = 1 15/20 + 2 4/20 + 1 12/20 = 4 31/20 = 5 11/20 2 1/4 + 1 5/8 + 7/16 = 2 4/16 + 1 10/16 + 7/16 = 3 21/16 = 4 5/16 1 4/9 + 2 5/6 + 1 7/12 = 1 16/36 + 2 30/36 + 1 21/36 = 4 67/36 = 5 31/36