Okie. i get it. you guys must like sports a lot
21x-9+63=180
21x+54=180
21x=126
x=6
Caitlin = 20 laps
Hannah = 4/5 as many laps
Multiply the laps swan by Caitlin (20) by 4/5
20 x 4/5 = 80/5 = 16
Hannah swam 16 laps
50 + 3x = 7x + 12
This is because of the exterior angle theorem.
