In an examination 60% of the candidates passed in English and 70% of the candidates passed in Mathematics - but 20% failed in both of these subjects. If 2500 candidates passed in both the subjects - the number of candidates who appeared at the examination was:

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In an examination 60% of the candidates passed in English and 70% of the candidates passed in Mathematics - but 20% failed in both of these subjects. If 2500 candidates passed in both the subjects - the number of candidates who appeared at the examination was:






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