Out of a class of 30 students, there are 16 students who study Latin, 21 who study German, and 7 who study both. What is the probability that a randomly selected student from the class will study only...

Out of a class of 30 students, there are 16 students who study Latin, 21 who study German, and 7 who study both.  What is the probability that a randomly selected student from the class will study only Latin?  Draw a Venn diagram to help you answer the question.