A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 5 years ago
jack has 4 red pencils, 3 green, 2 blue and purple. jack wants there to be a 1/2 chance that he will pick a purple pencil. how many more do you have to add so there will be a chance of1/2?
anonymous
 5 years ago
jack has 4 red pencils, 3 green, 2 blue and purple. jack wants there to be a 1/2 chance that he will pick a purple pencil. how many more do you have to add so there will be a chance of1/2?

This Question is Closed

radar
 5 years ago
Best ResponseYou've already chosen the best response.0Total number of pencils that Jack presently has is the sum of 4 red+3 green+2blue+2purple=11. So jack now has a 2 out of 11 probability of purple.

radar
 5 years ago
Best ResponseYou've already chosen the best response.0Let x = the additional purple pencils needed then from the information given: 2+x=1/2(22+x) The 1/2 is the required chance for purple. Multiplying each side by 2 gives: 4+2x=22 + x. Subtracting x from both sides result in: 4+x=22 subtracting 4 from both sides gives: x=18. Check it out!

radar
 5 years ago
Best ResponseYou've already chosen the best response.0Proof: With 18 additional purple pencils, Jack has a total of 40 pencils. 20 of them are purple. sure is a lot of pencils but he does have a 5050 chance of choosing a purple one.

radar
 5 years ago
Best ResponseYou've already chosen the best response.0Any questions on this solution?
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.