algebra

posted by .

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.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math again

    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 …
  2. math

    one bag of jelly beans contains 14 red jelly beans. how many red jelly beans would be found in 4 bag of jelly beans
  3. Math

    A box has 8 blue and 5 green jelly beans. A bag has 6 blue and 8 green jelly beans. A jelly bean is selected at random from the box and placed in the bag. Then a jelly bean is selected at random from the bag. If a green jelly bean …
  4. Math

    In a bag of red and black jellybeans 136 are red jb and the remaining r black jb if 15% of the jellybeans in the bag are black whatis the total number of jelly beans in bag A) 151 B 175 C) 175 D 200 E 906
  5. Math

    Tory has 4 blue jelly beans, 6 red jelly beans, 5 yellow jelly beans, and 1 green jelly bean in his bag. What fraction of the jelly beans are A)Blue B)Yellow C)Red D)Green
  6. Math

    In a bag of 400 jelly beans, 25% of the jelly beans are red in color. If you randomly pick a jelly bean from the bag, what is the probability that the jelly bean picked is NOT one of red jelly beans?
  7. math

    A jar of jelly beans contains 50 red gumballs , 45 yellow gumballs, and 30 green gumballs. You reach into the jar and randomly select a jelly bean, then select another without putting the first jelly bean back. What is the probability …
  8. data management gr.12

    In a bag there are 8 red jelly beans and 7 green jelly beans. The 4 jelly beans are randomly chosen from the bag without replacement. a)create a probability distribution table for choosing red jelly beans b)what is the probability …
  9. math

    In a bag there are 8 red jelly beans and 7 green jelly beans. The 4 jelly beans are randomly chosen from the bag without replacement. a)create a probability distribution table for choosing red jelly beans b)what is the probability …
  10. data management gr.12

    In a bag there are 8 red jelly beans and 7 green jelly beans. The 4 jelly beans are randomly chosen from the bag without replacement. a)create a probability distribution table for choosing red jelly beans b)what is the probability …

More Similar Questions