17. Which bus trip has the least number of people?
A. 1
C. 3
B. 2
D.4
18. Which bus trip has the greatest number of people?
A. 3
C. 5
B. 4
D.6
19. Which two bus trips will have a total of 100 people when combined?
A. 1 and 2
C. 4 and 5
B. 2 and 3
D. 5 and 6
20. What is the difference in the number of people between bus trip 2 and 6?
A. 20
C. 40
B. 30
D. 50