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Math Help - test average

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    test average

    You have an 85% average in math after 2 tests. If you score a 40% on this test, what will your new average be?
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    Quote Originally Posted by DINOCALC09 View Post
    You have an 85% average in math after 2 tests. If you score a 40% on this test, what will your new average be?
    lets count by points. so 85% means you average 85 points.

    Now \mbox{Average Score } = \frac {\mbox{Sum of scores}}{\mbox{Number of scores}}

    So, your old average was \frac {170}2 %

    your new average is \frac {170 + 40}3 %
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  3. #3
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    Quote Originally Posted by DINOCALC09 View Post
    You have an 85% average in math after 2 tests. If you score a 40% on this test, what will your new average be?
    \frac{x + y}{2} = 85 \Rightarrow x + y = 170.

    \frac{x + y + 40}{3} = ? \Rightarrow \frac{170 + 40}{3} = ? \Rightarrow ? = .......

    If the third test was on finding averages, you should get 60% as the answer .......
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