A box contains only Heart, Diamond, and Spade cards. A card is drawn at random. The table shows the probability of drawing a Heart card.
| Suit | Heart | Diamond | Spade |
|---|---|---|---|
| Probability | 0.25 |
The probability of drawing a Diamond card is the same as the probability of drawing a Spade card.
Complete the table.
There are 20 Heart cards in the box. Work out the total number of cards in the box.
