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Math Help - probability help

  1. #1
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    Exclamation probability help

    please can someone help me with this problem?

    the 29 students in a primary school mixed class are all either year 2 students or year three students.
    There ar ethe same number of yr two students in the class as as there are boys in the class.
    There are 8 yr 2 boys in the class.
    the number of yr 3 girls in the class exceeds the number of year 3 boys by 3.
    how many yr 3 girls are there in this class?



    I already know that I need to use a table for it, but I'm not too sure how to solve it!
    any help would be great! thankyou=]

    xxx
    mariks
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  2. #2
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    Quote Originally Posted by xch3m_is_l0v3x View Post
    please can someone help me with this problem?

    the 29 students in a primary school mixed class are all either year 2 students or year three students.
    There ar ethe same number of yr two students in the class as as there are boys in the class.
    There are 8 yr 2 boys in the class.
    the number of yr 3 girls in the class exceeds the number of year 3 boys by 3.
    how many yr 3 girls are there in this class?


    I already know that I need to use a table for it, but I'm not too sure how to solve it!
    any help would be great! thankyou=]

    xxx
    mariks
    This has nothing to do with probability so I don't know why you would give your post the title it has.

    Solve the following four equations simultaneously for G_3:

    B_2 + G_2 + B_3 + G_3 = 29 .... (1)

    B_2 + G_2 = B_2 + B_3 \Rightarrow G_2 = B_3 .... (2)

    B_2 = 8 .... (3)

    G_3 = B_3 + 3 .... (4)
    Last edited by mr fantastic; February 25th 2009 at 04:13 AM. Reason: Fixed equation 4
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