# Ratios and Percent

Using ratios to compute percent

How do you find the percent of a town's population of adults when the ratio of children to adults is 3 to 7?

### Comments for Ratios and Percent

 Sep 17, 2013 Compute Percent by: Staff Answer Part I The town's population = number of children + number of adults Since the ratio of children to adults is 3 to 7, for every 10 people there are 7 adults. The ratio of adults within the town population is 7 to 10. Percent is also a ratio. The only difference is that percent is based on a ratio with respect to the number 100, rather than the number 10. 7 is to 10 as x is to 100 7/10 = x/100 ------------------------------------------------

 Sep 17, 2013 Compute Percent by: Staff ------------------------------------------------ Part II solve for x multiply each side of the equation by 100 (7/10)*100 = (x/100)*100 (7/10)*100 = x (700/10) = x 70 = x x = 70 % ------------------------------------------------

 Sep 17, 2013 Compute Percent by: Staff ------------------------------------------------ Part III the final answer is: the percent of a town's population of adults = 70 % Thanks for writing. Staff www.solving-math-problems.com

 Mar 04, 2018 Ratio NEW by: Anonymous Divide 60 crayons between two pupils so that one gets twice as many as the other. how many crayons does each one get?