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?(:

c) To double the original probability of drawing a black bean, we need to find the number of black beans that, when added to the original bag, would result in a probability of 2/5.

Let's assume the number of black beans we need to add is x.

We can set up the following equation:

(60 + x) / (300 + x) = 2/5

Here, (60 + x) represents the number of black beans (including the ones we add) and (300 + x) represents the total number of beans (including the ones we add).

d) The equation that represents the problem in part (c) is:

(60 + x) / (300 + x) = 2/5