The structure of a proportion is
![(part)/(whole) = (part)/(whole)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/iut98nyzfjtlc1ibkzmzmx5yp6x9rtgvaw.png)
The whole of the first fraction is 5. This is because the survey is looking at incriments of 5 students
The part of the first fraction is 2. This is because a fraction (part) of the incriments of 5 students that ride the bike is 2.
The whole of the second fraction is 65. This is because there is a total of 65 students.
The part of this fraction is unknown (n)
So...
first fraction: part = 2 whole = 5
second fraction: part = n whole = 65
The proportion for this question is:
Hope this helped!
~Just a girl in love with Shawn Mendes