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?

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?

    posted by Steve

  2. could you show me how to do it

    posted by peter

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

    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

    posted by Reiny

  5. 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.

    posted by Steve

  6. 4/(x+7)=1/4
    x+7=16
    x=9

    posted by Crystal

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

    posted by Alison

  8. Fishy

    posted by Alison

  9. 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

    posted by Alison

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