# math again

posted by
**kali**
.

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?(: