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Boys' share, boys' average and class average: find the girls' average

The same question, asked 2 times: CDS 2 2016*, CDS 1 2020. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    CDS 2 2016

    92
    In a class of 100 students, there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average marks of the girls ?

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  2. Question 2

    CDS 1 2020

    34
    In a class room the ratio of number of girls to that of boys is 3:43 : 4. The average height of students in the class is 4.6 feet. If the average height of the boys in the class is 4.8 feet, then what is the average height of the girls in the class ?

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