15 points + BRAINLIST For 8 & 9, at what price is a 25% off coupon equal to $7.50 off the price. You must use algebra to show the answer.
If you just give me a number you will get 0 points. This is worth 2 points.

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