In a bag there are only red, blue, yellow, and white marbles.
A marble is taken at random from the bag.
The table shows the probabilities that the marble will be red or will be white.
| Colour | Red | Blue | Yellow | White |
|---|---|---|---|---|
| Probability | 0.25 | 0.15 |
The probability that the marble will be yellow is four times the probability that the marble will be blue.
There are 45 white marbles in the bag.
Work out the number of yellow marbles in the bag.
Practise OCR GCSE Maths Probability with exam-style questions for Foundation and Higher tier. 100 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.