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b). 4\5 + 3\7=28/35+15/35=43/35=1 8/35
c). 7\8 - 2\5=35/40-16/40=19/40
d). 11\12 - 1\6=11/12-2/12=9/12=3/4
e). 5\6 + 1\4=10/12=3/12=13/12=1 1/12
f). 4\9 + 3\5=20/45+27/45=47/45=1 2/45
g). 7\15 + 9\25= 70/150+54/150=124/150=62/75
h). 3\14 + 11\21=9/42+22/42=31/42
i) 2\3 - 7\8 +1\4=16/24-21/24+6/24=1/24
j). 1\5 + 5\6 - 7\15=6/30+25/30-14/30=17/30
k). 5\6 - 7\9 + 3\10=75/90-70/90+27/90=32/90=16/45
l). 1\3 - 1\4 + 3\14=28/84-21/84+18/84=25/84