Multiple Choice Questions on The average of 20 students class is 21 If the age of teacher is included then average increase by 2y........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The average of 20 students class is 21 If the age of teacher is included then average increase by 2y...........

Quantitative Aptitude ( CCS) Problems based on Ages
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    The average of 20 students class is 21. If the age of teacher is included then average increase by 2yr. Find age of teacher?

    60yr

    Incorrect Answer

    63yr

    Correct Answer

    66yr

    Incorrect Answer

    61yr

    Incorrect Answer
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    Explanation:

    Solution: 
    If the age of teacher is 21 then average remains unchanged but due to increase by 2yr, it means teacher gave 2yr to everyone( 20+1) =21
    21 + (21*2)
    21+ 42= 63 yr 

    By: Pranav Gupta
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