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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