How many have Bluetooth facility?

30% of the students in a class has mobile phones, 10% of the students who have mobiles phones has a Bluetooth facility. If the class has 200 students, how many have Bluetooth facility?

  1. 2
  2. 6
  3. 8
  4. 7
Anurag Mishra Professor Asked on 27th December 2015 in Maths.
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  • 1 Answer(s)

    Answer:  (2) 6 

    Explanation:-
    The total number of students in the class = 200

    30% of the students in a class has mobile phones, 
    Then, the number of students who have mobile phone = 200 x 30/100
     = 60 

    10% of the students who have mobiles phones have mobiles phones have a blue tooth facility. 
    Then,  the number of students who have a blue tooth facility = 60 x 10/100
      =  6

    Hence, the correct answer is option (2) 6. 

    Anurag Mishra Professor Answered on 27th December 2015.
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