Write the ratio of one group to the rest in simplest form

Write the ratio of the group named in the question to everyone else, in simplest form, like 2 : 3.

1. Out of 10 students, 2 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
2. Out of 18 students, 4 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
3. Out of 16 students, 14 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
4. Out of 16 students, 10 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
5. Out of 30 students, 21 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
6. Out of 18 students, 12 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
7. Out of 20 students, 12 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
8. Out of 21 students, 9 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
9. Out of 10 students, 8 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
10. Out of 10 students, 5 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
11. Out of 26 students, 12 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
12. Out of 24 students, 14 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
13. Out of 48 students, 28 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
14. Out of 30 students, 10 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
15. Out of 24 students, 15 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
16. Out of 34 students, 32 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
17. Out of 51 students, 21 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
18. Out of 44 students, 28 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
19. Out of 78 students, 42 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.
20. Out of 87 students, 63 walk to school. Write the ratio of students who walk to students who do not walk in simplest form.