  # Math - Percentage

How do you create a math equation using this information if 71% of adult use sunscreen and 71% is a large number how many use or do not use sunscreen?

### Comments for Math - Percentage

 Feb 23, 2012 Math - Percentage by: Staff Question: How do you create a math equation using this information if 71% of adult use sunscreen and 71% is a large number how many use or do not use sunscreen? Answer: Your question is rather vague. However, here is a math equation using the information supplied in the problem statement. x = number of adults using sunscreen y = total number of adults who do not use sunscreen x/(x + y) = .71 solve for x (x + y) * x / (x + y) = (x + y) * .71 x * (x + y) / (x + y) = (x + y) * .71 x * (x + y) / (x + y) = (x + y) * .71 x * 1 = (x + y) * .71 x = (x + y) * .71 x = .71x + .71y x - .71x = .71x - .71x + .71y x - .71x = 0 + .71y .29x = .71y .29x / .29 = .71y / .29 x * (.29 / .29) = .71y / .29 x * 1 = .71y / .29 x = .71y / .29 x = y * (.71 / .29) x = y * 2.44828 x = 2.44828y x = 2.44828y solve for y 2.44828y = x 2.44828y / 2.44828 = x / 2.44828 y * (2.44828 / 2.44828) = x / 2.44828 y * (1) = x / 2.44828 y = x / 2.44828 y = 0.40845x final answer: Number of adults who use sunscreen: x = 2.44828y Number of adults who do not use sunscreen: y = 0.40845x Thanks for writing. Staff www.solving-math-problems.com

 Jul 29, 2012 Thanks by: Anonymous Thanks-if this formula is correct you have really helped me out.