3) =7 1/2-9 3/50+5 7/25=7 25/50-9 3/50+5 14/50=3 36/50=3 18/25
4)20 1/5-11 2/15-6 1/3=20 3/15-11 2/15-6 5/15=2 11/15
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3) =7 1/2-9 3/50+5 7/25=7 25/50-9 3/50+5 14/50=3 36/50=3 18/25
4)20 1/5-11 2/15-6 1/3=20 3/15-11 2/15-6 5/15=2 11/15