A box contains 9 similar cards, each of which is holding a number divisible by 5 from 15 to 55. If a card is randomly selected, determine its probability of being divisible by 2 as well.
First list the numbers on the 9 cards.
Then find the probability that the number on a card is divisible by 2. The numbers that are divisible by 2 are 20, 30, 40, and 50.