Question

With the 20% off coupon, Alexis received a discount of $15 on her shoes. What was the regular price of her shoes before the 20% off coupon was applied? Justify your answer using equations, models, and/or words to explain your mathematical reasoning.
Answer:

Answer 1

Let the reg. price be r.

Then 0.20r = $15, and r = $75.  

Answer 2

The price is r.  

Then 0.20r = $15, and r = $75.