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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

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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.

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