The Shirts For All shop keeps track of the total number of white and tie-dye t-shirts it sells. In one week, 500 shirts were sold. White shirts cost $15 each, while tie-dye shirts cost $20 each. If the shop earned $9000 in revenue, how many of each type of t-shirt were sold that week? Which equations represent the scenario if w is the number of white shirts and t is the number of tie-dye shirts sold? Check all that apply.
w + t = 500
w + t = 9000
15w + 20t = 500
15w + 20t = 9000
20w + 15t = 9000