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Mathematics 19 Online
OpenStudy (anonymous):

Which pair of ratios forms a proportion? 11/36 , 121/180 13/21 , 39/63 14/23 , 70/92 20/51 , 45

OpenStudy (anonymous):

first set

OpenStudy (anonymous):

second set 13/21 : 39/63 = 1 : 3

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