Answer:
12 weeks
Step-by-step explanation:
your account
75 total
5 a week to add in
friend account
30 total
10 a week to add in
you need to first recognize that the friend might have a lower balance but he will be adding in double a week compared to you.
it will take him it will take you
starting 30 75
week 1 40 80
week 2 50 85
week 3 60 90
week 4 70 95
week 5 80 100
week 9 90 105
week 10 100 110
week 11 110 115
week 12 120 120
