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Math Help - assessment test in a few days in some help!

  1. #1
    SMl
    SMl is offline
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    assessment test in a few days in some help!

    Need Help! Would like To know How to solve these..... Would like to know step by step(formula)

    Numerical Skills/Prealgebra

    13. Adam tried to compute the average of his 7 test scores. He mistakenly divided the correct sum of all of his test scores by 6, which yielded 84. What is Adam’s correct average test score?
    A. 70
    B. 72
    C. 84
    D. 96
    E. 98


    14. A total of 50 juniors and seniors were given a mathematics test. The 35 juniors attained an average score of 80 while the 15 seniors attained an average of 70. What was the average score for all 50 students who took the test?
    A. 73
    B. 75
    C. 76
    D. 77
    E. 78
    Last edited by mr fantastic; April 29th 2009 at 04:31 PM. Reason: Moved all the other questions to other threads
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  2. #2
    Senior Member chella182's Avatar
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    Question 13... Initially you need to find the sum of all of his test scores. To do this, you do 84\times 6 to undo the dividing by 6. Then divide this number (which is 504, by the way) by the 7 to obtain 72 as your answer.

    Question 14 is similar to the problem above really. Multiply the juniors' average score of 80 by the 35 to get 2800, and multiply the seniors' average score of 70 by the 15 to get 1050. Add these two together (to obtain the total of all scores) to get 3850. Then finally, to get the total average, divide by the total number of students (50) to get 77 as your answer.

    Hope this helps.
    Last edited by mr fantastic; April 29th 2009 at 04:32 PM. Reason: Moved all the other answers to the threads I moved the other questions to.
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