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the mean weight of 360 students …

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the mean weight of 360 students in a school is 50kg . the mean weight of boys is 60 kg and that of girls is 45 kg . find the number of boys

    • Posted by Riddhi Mathur 4 years ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    My Guide ... 4 years ago

    Let x be the number of boys, then the number of girls will be (60−x). The mean weight of boys is 50 kg, then the total weight of boys will be, 50x. The mean weight of girls is 30 kg, then the total weight of girls will be 30(60−x)=1800−30x. The mean weight of 60 students is 40 kg, so totalno.ofstudentsweightofgirls+weightofboys​=40 601800−30x+50x​=40 x=20600​ x=30 So, the number of boys is 30 and the number of girls is (60−30)=30.

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