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September 19, 2014

September 19, 2014

Posted by **desperate!** on Wednesday, February 24, 2010 at 11:04pm.

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 -
**MathMate**, Thursday, February 25, 2010 at 8:54amAdd 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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