Multiple Choice Questions on The average age of 15 army men is 60yrs 5 new army men of average age 30yrs join them Find the ........... for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

The average age of 15 army men is 60yrs 5 new army men of average age 30yrs join them Find the ...........

Quantitative Aptitude (RRB NTPC) Average
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    The average age of 15  army men is 60yrs.5 new army men of average age 30yrs join them. Find the new average age:

    51.5

    Incorrect Answer

    52.5

    Correct Answer

    55.2

    Incorrect Answer

    55.8

    Incorrect Answer
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    Explanation:

    15 army men age = 15*60 =900
    5 army men age = 5*30 = 150
    New avg = 900+150/20 =52.5

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