math

A compact disc is placed in a player that randomly selects and plays songs from the disc.The compact disc contains 3 ballads, 4 instrumental pieces,X dance tracks and no other pieces.If the probability that the first song played will be a ballad is 1/4,what is the value of X?

  1. 0
  2. 0
  3. 7
asked by peter

  1. since there are 3 ballads, and 1/4 of the total are ballads, there must be 12 songs in all. That help?

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    posted by Steve

  2. could you show me how to do it

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    posted by peter

  3. is it 3 / 1/4 = 12 ?

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    posted by peter

  4. pieces on disc
    = 3 + 4 + x
    = x+7

    prob of picking one of the 4 ballads
    = 4/(x+7)
    but we are told
    4/(x+7) = 1/4
    x+7 = 16
    x = 9

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    posted by Reiny

  6. one hitch is that there are only 3 ballads.

    Anyway, peter, fix that and redo Reiny's calculations to find that x=5.

    As for my hint, since there must be 12 songs in all, the missing x pieces must total 5.

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    posted by Steve

  7. 4/(x+7)=1/4
    x+7=16
    x=9

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    posted by Crystal

  8. Help I don't understand sorry for this but help stil don't understand THANKS
    VERY
    MUCH

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    posted by Alison

  9. Fishy

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    posted by Alison

  10. Me like to eat
    From Alison Chen
    Princess is the only person I can trust and understand how to help me
    Truth I am a boy but my mom accident give me a girl name
    I love princess princess so much princess princess is princess princess is princess princess

    Prince prince

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    posted by Alison

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