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?

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3. 7
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
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.

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

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

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posted by Alison
8. Fishy

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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

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posted by Alison

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