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b) 7 1/2 : 1 2/3 : 1/6=15/2*5/3 / 1/6=15/2*3/5*6/1=54/2=27
c) 17: 1/3=17/1*3/1=51
d) 1 11/25 x 5/9 x 15=36/25*5/9*15=4/2*15=7,5