2. Sample Papers
  3. NTSE

NTSE Sample Paper NTSE SAT Practice Test-9

  • question_answer
    Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?

    A) 4           

    B) 10

    C) 15                                

    D) 16

    Correct Answer: D

    Solution :

    [d] L.C.M. of 2, 4, 6, 8, 10 and 12 is 120 seconds or 2 min. So the bells will together toll after every two minutes. In 30 minutes, they will toll together \[\left( 30\div 2 \right)+1=16\] times.


You need to login to perform this action.
You will be redirected in 3 sec spinner