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b). 5 20/21 : 5 5/9 X 1 19/30= 125/21 : 50/9 X 49/30= 125/21 X 9/50 X 49/30=1125/1050 X
X 49/30=55125/31500=1 189/252
c).8 1/3 : 16 2/3 : 3 1/2= 25/3 :50/3 : 7/2= 25/3 X 3/50 :7/2= 25/50 : 7/2= 25/50 X 2/7=
= 50/350= 1/7