20:(6 3/11 + 1 8/11) + (7 2/5 - 5 4/5) :5=20/8 + 13 1/5=2 20/40 + 13 8/40=
= 15 28/40 = 15 7/10
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20:(6 3/11 + 1 8/11) + (7 2/5 - 5 4/5) :5=20/8 + 13 1/5=2 20/40 + 13 8/40=
= 15 28/40 = 15 7/10