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help lol

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Rate your uni — help us build a league table based on real student views 19-08-2015
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    There are 15 more girls than boys. there are 10 boys for every adult. If there are x boys and girls together, how many adults are there?
    despite the fact doing a level maths I couldn't solve it and feel embarrassed. in addition this is supposedly a secondary school question wTf
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    Let g = girls
    Let b = boys
    Let a = adults

    g = b + 15

    b = 10a
    a = b/10

    g + b = x

    --

    (b + 15) + b = x

    2b + 15 = x

    b = (x - 15)/2

    b/10 = (x-15)/20

    a = (x-15)/20
  3. Offline

    (Original post by aznkid66)
    10b = a
    Tempting, but more like b = 10a.
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    ReputationRep:
    (Original post by ghostwalker)
    Tempting, but more like b = 10a.
    why is that
  5. Offline

    (Original post by StylaBoy)
    why is that
    10 boys for each adult.

    If there is one adult, there are 10 boys, i.e. the number of boys is 10 times the number of adults, hence b=10a.

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