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Subhangi, yes the question is wrong. But anyways n(S)=15 , so I assumed only seniors as 15, then we will get both (senior and chem) as 20 and only chem as 5. So those who are not senior =5 and those who are not senior=25. So 5 is 20% of 25. I worked out by drawing venn diagram.
HBS: Reimagining Capitalism: Business and Big Problems : Growing income inequality, poor or declining educational systems, unequal access to affordable health care and the fear of continuing economic distress...