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= 37/5 + 39/6
= 222/30 + 195/30
= 417/30
= 13 27/30
= 13 9/10
b) 54 5/7 + 27 3/4
= 383/7 + 111/4
= 1532/28 + 777/28
= 2309/28
= 82 13/28
c) 19/20 - 3/5
= 19/20 - 12/20
= 7/20
d) 11 1/3 - 8 1/7
= 34/3 - 57/7
= 238/21 - 171/21
= 67/21
= 3 4/21