harley had $500 in his bank account at the beginning of the year. he spends $20 each week on food, c

harley had $500 in his bank account at the beginning of the year. he spends $20 each week on food, clothing, and movie tickets. he wants to have more than $100 at the end of summer to make sure he has enough to purchase some new shoes before school starts. how many weeks, w, can harley withdraw money from his savings account and still have more than $100 to buy new shoes?

Let the number of weeks be w. Harley needs $100 (or more) for shoes. We have the balance in Harley's account as:
500 - 20w >= 100

To solve this inequality for w, we type it in our search engine and we get:
w <= 20