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                            In an examination, 49% students failed in English, 36% students failed in Hindi, While 15% failed in both. If total number of passed students in 450, then how many students did appear in the examination? | 
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 Answer: Option D Explanation: According to the formula . Percentage of students passed in both the subjects = [100 - (x + y - z)]% = [100 - (49 + 36 - 15)]% = 30% Let total number of students = N According to the question, 
 
 
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 (N x 30)/100 = 450
 Total number of students = 1500