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@PEI

我小孩有道题不会做，想请大家帮忙。

bilinguist(不平则鸣)
The cost of taking a class to a beach party is partly constant and partly varies
inversely as the number of students.If 12 students are taken,then it costs each student $4.
If 30 students were to go it would cost each student $1.20.
a)What would it cost to take 60 students?
b)What costs would be included as part of the constant cost?

Answer: a) 32


hint: T=S+kn where k is the constant of variation
n is the number of copies
S is the fixed cost
T is the total cost
(#807691@0)
Last Updated: 2002-10-20
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Replies, comments and Discussions:

  • 枫下家园 / 家庭与子女 / 我小孩有道题不会做，想请大家帮忙。 -bilinguist(不平则鸣); 2002-10-20 {537} (#807691@0)
    The cost of taking a class to a beach party is partly constant and partly varies
    inversely as the number of students.If 12 students are taken,then it costs each student $4.
    If 30 students were to go it would cost each student $1.20.
    a)What would it cost to take 60 students?
    b)What costs would be included as part of the constant cost?

    Answer: a) 32


    hint: T=S+kn where k is the constant of variation
    n is the number of copies
    S is the fixed cost
    T is the total cost
    • (1). 12X4=S+12K (2). 30X1.2=S+30K 计算: K=-2/3 S=56 然后 T=56+60X(-2/3)=16... 不会了 -midnightblues(和starinfo开中介); 2002-10-20 (#807703@0)
    • 56 -laoyou(老游); 2002-10-20 (#807704@0)
    • S = 28 -jeffrey815(Smartiecat); 2002-10-20 {165} (#807750@0)
      K is inversely so the equation goes

      T = S + K/N

      48 = S + K/12
      36 = S + K/30

      S = 28
      K = 240

      a) When n = 60, T = 28 + 4 =32.
      b) Constant cost is S = 28.
      • hahahaha, inversely. 我估计现在读小学我都不及格了, :((((((((( -midnightblues(和starinfo开中介); 2002-10-20 (#807755@0)
      • Yes. Thank you! Only you are right up till now! Thank you very much! -bilinguist(不平则鸣); 2002-10-20 (#807802@0)

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