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algebra

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You have a bag with 60 black jelly beans and 240 red ones.

a) If you draw one jelly bean out of the bag, find the probability that it is black.
-------60/300= 1/5

b) If you add 60 black jelly beans to the original bag and draw out a bean, what is the probability that it is black?
-------120/360= 1/3

c) How many black beans do you need to add to the original bag to double the original probability of drawing a black bean?

d) Write an equation that represents the problem in part (c).

I GOT A AND B JUST NEED C AND D PLEASE?(:

  • algebra -

    Add x black beans.
    Probability of drawing a black bean after adding more black beans
    =(60+x)/(300+x)
    If that has to be doubled from before (1/5=60/300), then
    (60+x)/(300+x)=2*(1/5)
    solve for x.

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