Answer:
?
Step-by-step explanation:
sorry
answer is B
use unitary method to solve it
1st → 1st
2nd → 3rd
3rd → 2nd
just divide the first set of student wishes to the second set of students in the same question. the 1st for example
x-ray to all students is 6/ 36= 1/6 = 1:6
for all students, you add all the students in the table