Tim has 30 jellybeans, with equal numbers of three flavors—raspberry, pineapple, and orange. he likes raspberry the best. so far, tim has eaten 6 orange and 4 pineapple jellybeans. what are the chances that the next one he picks will be raspberry?

Before Tim ate any of the jellybeans, here are numbers: 

pineapple or p  =10
raspberry or  r = 10
orange or o = 10
 
Tim has eaten 6 orange and 4 pineapple jellybeans. Hence, what's left are: 

 p = 10-4 =6
o = 10-6 =4
r = 10 so now total jelly beans are 20

So the probability of getting a raspberry is: 

p(r) = number of r/total
10/20 or 50%