B1. The diagram shows the absences of students in one week. On Monday, one-ninth of all students in the class were absent, and on Wednesday, only girls were absent.

a) On which day were 4 students absent?

b) On which day were all students present?

c) How many students are there in the class?

d) Was the absence on Friday more than $10 \%$ of the students?

e) How many girls are in the class?

![](https://cdn.mathpix.com/cropped/2024_06_07_e4711ece0d44ad9bc5c3g-4.jpg?height=580&width=642&top_left_y=1012&top_left_x=1278)
B1. From the diagram, we read that 4 students were absent on Wednesday, and that no students were absent on Thursday. Since we know that on Monday, one-ninth of all students were absent, and from the diagram we read that 3 students were absent that day, there are 27 students in the class. On Friday, 2 students were absent, which is less than $10 \%$ of all students. Since only girls were absent on Wednesday, there are at least 4 girls in the class, but we cannot conclude how many there are from this information.

## Scoring: Total: 7 points

![](https://cdn.mathpix.com/cropped/2024_06_07_e4711ece0d44ad9bc5c3g-7.jpg?height=57&width=1607&top_left_y=680&top_left_x=310)

![](https://cdn.mathpix.com/cropped/2024_06_07_e4711ece0d44ad9bc5c3g-7.jpg?height=57&width=1596&top_left_y=745&top_left_x=310)

c) There are 27 students in the class. ................................................................ 2 p

d) On Friday, fewer than $10 \%$ of the students were absent. .......................................... 2 p

e) The number of girls in the class cannot be determined. ......................................................