Anew basketball costs $25.00 at the sporting goods store. if the store is having a going-out-of-business sale and everything is 60% off, what is the actual cost of the basketball?

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30