Answer:
15 students
Step-by-step explanation:
The fraction of students who will repeat the exam is:

=
simplified is:

Extract this fraction of 45:

Hope this helps
3 minutes
10*8*12=960 cubic inches
960/320inches per minute =3
I believe that it might be 15x+9
You're answer could be the mixed number 19 6/7 or the improper fraction 139/7