In a box there are only green marbles, yellow marbles and purple marbles. A marble is taken at random from the box.
The table shows the probability of getting a green marble.
| Colour | Green | Yellow | Purple |
|---|---|---|---|
| Probability | 0.4 |
the number of yellow marbles : the number of purple marbles = 1 : 4
Complete the table.
93 exam-style questions on OCR GCSE Maths Ratio. Each one has a worked solution and a mark scheme showing where the marks go.