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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

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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.


Ratio of Adults to Town Population





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


Ratio of Adults to Town Population versus Percent of Adults in Town Population






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Sep 17, 2013
Compute Percent
by: Staff


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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 %



Percentage Ratio - definition





Equation used to calculate Percent








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Sep 17, 2013
Compute Percent
by: Staff


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Part III



Solve for Percent





Percent of Adults within town population = 70%





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?

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