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In an English exam conducted by the UPSC, hundred aspirants appeared. The average marks for the hundred aspirants in the exam is 39%. The average marks for the aspirants who passed the exam is 60%. The average marks for the aspirants who failed the exam is 30%. The number of aspirants who passed the exam is
25
30
35
40
Average of (total)100 aspirant=39% Average of passed aspirants=60% Average of failed aspirants=30%
By using mixture and alligation
pass fail 60 30 39 9 21 3:7
=> 10=100 1=10 3=10 x 3=30
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