Final answer:
The ratio problem indicates that for every 13 people, 9 are adults and 4 are students. Given a total of 156 people, each 'part' in our ratio represents 12 people. Multiplying 9 (representing adults) by 12, there are 108 adults in the course.
Step-by-step explanation:
This is a ratio problem in mathematics, specifically it uses the concept of ratio proportion.To find the number of adults taking the course, we need to determine the number of adults and students in the ratio. The ratio of adults to students is given as 9 to 4, which means for every 9 adults, there are 4 students. In total, there are (9+4) = 13 parts. Given that there are 156 people taking the course, we can find the value of one part by dividing 156 by 13, which results in 12. This tells us that each 'part' in our ratio represents 12 people. To find the number of adults (9 parts), multiply 9 by 12. Therefore, there are 108 adults taking the course.
Learn more about Ratio Proportion