In a box there are only green marbles, yellow marbles and black marbles.
A marble is taken at random from the box.
The table shows the probability of getting a green marble.
| Colour | Green | Yellow | Black |
|---|---|---|---|
| Probability | 0.3 |
The probability of getting a yellow marble is the same as the probability of getting a black marble.
Complete the table.
There are 15 green marbles in the box.
Work out the total number of marbles in the box.
