The average number of weekly social media posts varies jointly with the poster's yearly income (In thousands) and inversely with their age in years. If a 60-year-old person with an income of $100,000 posts an average of 300 times in a week, what is the value of k?
k = 100
k = 300
k = 180
k =225

Solve the problem by using a venn diagram a group of students were surveyed about their taste in music. they were asked how they like three types of music: rock, country western and jazz. the results are summarized below: no one dislikes all three types of music. six like all three types of music. eleven don’t like country western. sixteen like jazz. three like country western and jazz, but not rock. six don’t like rock. eight like rock and country western. seven don’t like jazz. how many students were surveyed?