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

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) (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.
.
(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.

RELATED QUESTIONS
Hi tutors, can you help me answer this question? thanks A jar contains red, blue,... (answered by josgarithmetic)

There are 10 red jelly beans, 8 blue jelly beans, and 12 white jelly beans in a jar, and... (answered by ikleyn,greenestamps)

A jar contains 18 red jelly beans, 22 yellow jelly beans, and 14 orange jelly beans.... (answered by manu17)

A jar contains 15 red jelly beans, 12 yellow jelly beans, and 18 orange jelly beans.... (answered by EdenWolf)

A jar of 252 multi coloured jelly beans contains 84 red jelly beans.if 21 jelly bean are... (answered by ikleyn)

In a jar of 960 jelly beans 1/6 of the jelly beans are red and 1/8 of the jelly beans are (answered by checkley77)

Ronald Reagan Rewind As you may know, former President Reagan really enjoyed jelly... (answered by josmiceli)

A jar contains four red, four yellow, and three green jelly beans. If Joan and Jim take... (answered by robertb)

A glass jar contains 5 red, 3 blue and 2 green jelly beans. If a jelly bean is chosen at... (answered by rothauserc)