Answer:
Week 7
Explanation:
Connie will have $170 in week 7, because in 3 weeks she will add $30 to her account.
Ling will have $117.5 in week 7, because in 3 weeks he will add $4.50 to his account.
170-117.5=52.5
52.5 is greater than 50, so it satisfies the question.