A survey asked a group of students to choose their favorite type of music from the choices of rock, hip-hop, and country. The re
sults of the survey are shown in the graph. Based on the graph, how many more students in a class of 270 students would be expected to choose country than rock? A) 10
B) 20
C) 30
D) 60
Step-by-step explanation: We start with the fraction 1/180, found by putting 20 seconds over one hour. Then, we need to get the amount of miles the speed of sound travels in 20 seconds. We can use the fraction above as a ratio to get it. 720/1 x 1/180 = 4 miles. Then, we'll just do 4 times 5280, which is 21120.