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NTSE Sample Paper NTSE SAT Practice Test-11

  • question_answer
    The average weight of 150 students in a certain class is 60 kg. The mean weight of the boys from the class is 70 kg, while that of girls is 55 kg. What is the number of girls in the class?

    A) 105                              

    B) 100

    C) 95                                

    D) 60

    Correct Answer: B

    Solution :

    [b] Let there be x girls and \[\left( 150-x \right)\]boys. \[\Rightarrow 55x+70\left( 150-x \right)=\text{ }150\times 60\] \[\therefore \text{ }x=100.\]


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