Respuesta :

Answer:

35:15

Step-by-step explanation:

7:3=10 (7+3)

14:6=20 (14+6)

21:9=30 (21+9)

28:12=40 (28+12)

35:15=50 (35+15)

There is a more mathematical way to solve this but it isn't coming to mind rn so