Multiple Choice Questions on There are two groups A and B of a class consisting of 42 and 28 students respectively If the average........... for NABARD Assistant Manager Exam Preparation

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Multiple Choice Questions

There are two groups A and B of a class consisting of 42 and 28 students respectively If the average...........

Quantitative Aptitude (Phase-1) Average
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    There are two groups A and B of a class, consisting of 42 and 28 students respectively. If the average weight of group A is 25 kg and that of group B is 40 kg, find the average weight of the whole class.

    69

    Incorrect Answer

    31

    Correct Answer

    70

    Incorrect Answer

    30

    Incorrect Answer
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    Explanation:

    Average weight of both groups  = \frac{42\times25 + 28\times 40}{42+28}

    = \frac{1050 + 1120}{70} = \frac{2170}{70} = 31 kg.

    Hence, option 2 is the correct answer.

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