If Billy Bob earns -11% commission on every Diggity Dawg he sells, and in May he sells four Diggity Dawgs for $2500 each, what is his commission for May?

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Math i have no idea how to do a and b

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?