In an examination, 70% of the students passed in the Paper I, and 60% of the students passed in the Paper II: 15% of the students failed in both the papers while 270 students passed in both the papers. What is the total number of students?

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Q: 7 (IAS/2008)
In an examination, 70% of the students passed in the Paper I, and 60% of the students passed in the Paper II: 15% of the students failed in both the papers while 270 students passed in both the papers. What is the total number of students?
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question_subject: 

Maths

question_exam: 

IAS

stats: 

0,5,7,5,5,2,0

keywords: 

{'paper ii': [0, 0, 1, 0], 'total number': [0, 0, 3, 0], 'students': [0, 1, 1, 1], 'examination': [0, 0, 1, 1], 'papers': [1, 0, 1, 1]}