28% members of a certain group are married. What is the respective ratio between the number of married members to the number of unmarried members? 

(a) 7:17 (b) 5:18 (c) 7:18 (d) Cannot be determined (e) None of these


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(c) 28% are married it implies that 72% are unmarried.
Ratio = 28 : 72
= 7 : 18

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