Answer:
10 weeks
Step-by-step explanation:
I added downwards like this=
50 0
5 (55) 10(10)
5 (60) 10 (20)
5 (65) 10 (30)
5 (70) 10 (40)
5 (75) 10 (50)
5 (80) 10 (60)
5 (85) 10 (70)
5 (90) 10 (80)
5 (95) 10 (90)
5 (100) 10 (100)
As you can see, they both are equal to 100 after 10 weeks.