SOLUTION: A jar contains red, blue, yellow, pink and white jelly beans. James wants to estimate the number of jelly beans in the jar. James adds 90 black jelly beans and mixes the jelly bean

Algebra ->  Probability-and-statistics -> SOLUTION: A jar contains red, blue, yellow, pink and white jelly beans. James wants to estimate the number of jelly beans in the jar. James adds 90 black jelly beans and mixes the jelly bean      Log On


   

Question 983999: A jar contains red, blue, yellow, pink and white jelly beans. James wants to estimate the number of jelly beans in the jar. James adds 90 black jelly beans and mixes the jelly beans thoroughly. He draws out 120 jelly beans at random and finds that he has 18 black jelly beans. How many jelly beans should he estimate were originally in the jar?
A. 480
B. 510
C. 600
D. 690
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
.
(18/120)(100%)=15%
The black jelly beans should be about 15% of the total.
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(90/0.15)=600
90 black beans are 15% of 600 jelly beans.
.
600 total jelly beans-90 added black jelly beans=510 original jelly beans
Subtract the 90 added black jelly beans to find the original number.
ANSWER: There were originally 510 jelly beans, so (B) is correct.