Multiple Choice Questions on A group of 20 girls has average age of 12 years Average age of first 12 from the same group is 13 ye........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A group of 20 girls has average age of 12 years Average age of first 12 from the same group is 13 ye...........

Quantitative Aptitude ( CCS) Problems based on Ages
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    A group of 20 girls has average age of 12 years. Average age of first 12 from the same group is 13 years. What is the average age of other 8 girls in the group

    10

    Incorrect Answer

    11

    Incorrect Answer

    11.5

    Incorrect Answer

    None of these

    Correct Answer
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    Explanation:

    Average of 20 girls = 12

    Total average = 20 x 12 = 240

    Average of first 12 girls = 12 x 13 = 156

    Remaining total average of 8 girl's = 240 - 156 = 84

    Average age of of 8 girls = 84/8 = 10.5 years.

    Hence, option 4 is the correct answer.

    By: Amit Kumar
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