3/5:11/15 =3/5*15/11=9/11
27/40:18/35 =27/40*35/18=21/16=1 5/16
1:3/7 =1*7/3=2 1/3
8/27*36=32/3=10 2/3
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3/5:11/15 =3/5*15/11=9/11
27/40:18/35 =27/40*35/18=21/16=1 5/16
1:3/7 =1*7/3=2 1/3
8/27*36=32/3=10 2/3