You are Here: Home >< GCSEs

# a Probability question watch

"A bag contains red and blue balls. The probability of picking a blue ball is 5/9. There are more than 10 balls in this bag. Write down how many red balls could be in this bag?"

This is year 9 Maths question.

Thank you!
2. 4 times any integer greater than 1. I dunno. Quite a weird question.
3. just times it by two, because it says how many could be in the bag, there is more than one answer. So , make the denominator more than 10,

(5/9)x2=10/18 so there could be 10 red balls in the bag...

It's quite a weird question to be honest, but anyway hope this helped
4. (Original post by zwastix)
just times it by two, because it says how many could be in the bag, there is more than one answer. So , make the denominator more than 10,

(5/9)x2=10/18 so there could be 10 red balls in the bag...

It's quite a weird question to be honest, but anyway hope this helped
that's the number of blue balls. it would be in your case (4/9)*2 ... etc
5. (Original post by Chef289)
that's the number of blue balls. it would be in your case (4/9)*2 ... etc
Yes sorry, didn't read the question probably, but same method i think
6. 10/18 looks a good method to solve it, so red ball is 8.

Thanks zwastix and Chef289 for help!

best regards!

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: February 5, 2017
Today on TSR

### Summer Bucket List is Back!

Start yours and you could win £150!

Poll
Useful resources

## Study tools

### Essay expert

Learn to write like a pro with our ultimate essay guide.

See where you can apply with our uni match tool

### Make study resources

Create all the resources you need to get the grades.

### Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

### Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

### Find past papers

100s of GCSE past papers for all your subjects at your fingertips.