21. In an examination, 40% students failed in Hindi, 50% students failed in English. If 21% students failed in both the subjects, find the percentage of those who passed in Hindi.
    

1. 1. 31%

   
   
   

   2. 40%

   
   
   

   3. 55%

   
   
   

   4. 60%

   
   
   

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1. View Hint View Answer Discuss in Forum

   In 40% students failed Hindi then 60% students passed in Hindi.
   

   Correct Option: D

   In 40% students failed Hindi then 60% students passed in Hindi.

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22. In a certain office, 72% of the workers prefer cold drink and 44% prefer tea. If each of them prefers cold drink or tea and 40 like both, then the total number of workers in the office is:
    

1. 1. 40

   
   
   

   2. 240

   
   
   

   3. 220

   
   
   

   4. 210

   
   
   

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1. View Hint View Answer Discuss in Forum

   72% + 44% = 116%
   ∴ 16% → 40
   ∴ 100% → 40 100 16 × = 250

   Correct Option: A

   72% + 44% = 116%
   ∴ 16% → 40
   ∴ 100% → 40 100 16 × = 250
   Hence, 16% workers are there who prefer both drinks which are 40 in number.
   

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23. In a survey of a town, it was found that 65% of the people surveyed watch the news on T.V. 40% read a newspaper and 25% read a newspaper and watch the news on T.V. What per cent of the people surveyed neither watch the news on T.V. nor read a newspaper?
    

1. 1. 5%

   
   
   

   2. 10%

   
   
   

   3. 20%

   
   
   

   4. 15%

   
   
   

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1. View Hint View Answer Discuss in Forum

   Required percentage
   = 100 – (40 + 25 + 15)
   = 100 – 80 = 20%
   

   Correct Option: C

   Required percentage
   = 100 – (40 + 25 + 15)
   = 100 – 80 = 20%
   

   
   

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24. √64009 is equal to :

1. 1. 352

   
   
   

   2. 523

   
   
   

   3. 253

   
   
   

   4. 532

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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