Answer:
r = 7.48
Step-by-step explanation:
47/2 = 23.5
23.5/ 7.48
r= 7.48
We know that ratios can be shown with both fractions and colons.
20:705
or

It also looks like we can simplify this by dividing by 5.
20/5 = 4
705/5 = 141.
This means that for every 4 teachers, there are 141 students.
The ratio for teachers to students is:
4 : 141
15^2x is 225x. So, we have 225x-3=245. Adding three to both sides, we get 225x=248. Dividing by 225, we have x=248/225.
She needs to run around it 5 times because if 1 mile is six runs that means 1 mile is 1/6 of a run. 1/6 x 5 =5/6