Question 1: A dual bar chart shows the number of students choosing different sports in two classes. Class A has 25 students for Football and 15 for Basketball. Class B has 20 students for Football and 25 for Basketball. Calculate the difference in the number of students choosing Football between the two classes.

Answer: 5

Question 2: Construct a dual bar chart to compare the following data: Class X has 18 students reading Fiction and 12 reading Non-fiction. Class Y has 22 reading Fiction and 10 Non-fiction.

Answer: Draw bars with heights 18 and 12 for Class X; 22 and 10 for Class Y.

Question 3: In a dual bar chart, the number of male and female students who prefer Science is shown. If males are 30 and females are 20, what is the ratio of males to females?

Answer: 3:2

Question 4: A dual bar chart compares the number of cars sold by two dealerships over a month. Dealership A sold 50 cars in Week 1 and 70 in Week 2. Dealership B sold 60 cars in Week 1 and 70 in Week 2. Which dealership had a greater increase from Week 1 to Week 2?

Answer: Dealership A

Question 5: Using the data in Question 4, calculate the total cars sold by both dealerships over the two weeks.

Answer: A: 120, B: 130

Question 6: A dual bar chart shows the number of students who prefer different subjects. If 40 students prefer Math and 30 prefer Science in Year 1, and 35 prefer Math and 25 prefer Science in Year 2, compare the total preferences for Math and Science across both years.

Answer: Math: 75, Science: 55

Question 7: A teacher compares the number of books read by students in two classes using a dual bar chart. Class A read 12 fiction and 8 non-fiction books. Class B read 15 fiction and 10 non-fiction books. Determine which class read more fiction books and by how many.

Answer: Class B by 3 books

Question 8: A dual bar chart shows the number of hours worked by two employees per week. Employee X worked 40 hours and 45 hours in two weeks, while Employee Y worked 50 hours and 55 hours. Who worked more hours in total? Show your calculation.

Answer: Employee Y: 105 hours; Employee X: 85 hours; Y worked more.

Question 9: Identify and correct the mistake: A dual bar chart shows that in Year 1, 30 students like apples and 40 like oranges; in Year 2, 25 like apples and 35 like oranges. The chart suggests that apples are more popular in Year 2, which is incorrect.

Answer: Mistake: The data shows apples are less popular in Year 2. Correct: Year 2 has 25 apples, less than 30 in Year 1.

Question 10: A dual bar chart compares the number of students choosing different modes of transport: Bus, Car, Bicycle. In a school survey, 60 students take the bus, 40 drive cars, and 20 cycle. If 15 students change from Bus to Car, how does this affect the total number of students still taking each mode?

Answer: Bus: 45, Car: 55, Bicycle: 20; total remains same.