help with a math question!?

Question

currently,you have $60 and your sister has $135. You decide to save $5 of your allowance each week, while your sister decides to spend her whole allowance plus $10 each week. How long will it be before you have as much money as your sister?
1. write an equation for the model.
2.solve the equation and answer the question

Answer 1

let x be the number of weeks

60 + 5x = 135 - 10x
15x = 75
x = 5

5 weeks

Answer 2

Let x be the duration

Amount you will have for yourself:
60+5x where x is the number of weeks

AMount your sister will have:
135-10x

1. 60+5x=135-10x
15x=75
2. x=5