You draw a single card from a standard deck of 52 cards. What is the probability that it is a face card (jack, queen, or king)?
There is a 23% chance you would get a jack, queen, or king. You get this by adding up all the royal cards, and dividing it by the total amount of cards.
probability = number of ways event can happen / total number of possible outcomes
In this case...
probability = number of face cards / total number of cards in the deck
There are 12 face cards in a deck. There are 52 cards total.
probability = 12 / 52 Reduce the fraction by 4.
probability = 3 / 13 ( which is ≈ 23% like Absolutezero said :) )