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Equivalent Ratios

Determine whether or not two ratios are equal.

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Male-to-Female Ratios

Credit: Beverley Goodwin
Source: http://www.flickr.com/photos/37390607@N02/10014783096
License: CC BY-NC 3.0

Is the human population half male and half female? Not exactly. The ratio of males to females changes with age. And not every place has the same male-to-female ratio.

Cradle to Grave

In America, about 105 boys are born for every 100 girls. Even though boys start out in the lead, by the time you reach 35, there will be only 99 men for every 100 women in your age group. What happens to all the extra boys? Males are more likely to die at a younger age. They're more likely to get in car accidents, become involved in violence, or take dangerous jobs. The ratios become even more skewed with age. By the time people hit their eighties, there are only about 41 men for every 100 women.

Credit: John Walker
Source: http://www.flickr.com/photos/8047702@N07/4608963722/
License: CC BY-NC 3.0

Gender imbalances turn up in other places besides nursing homes. For instance, the ratio of male college graduates to female college graduates is 43 to 57. This means that for every 100 female graduates, there are only 75 male graduates. Some colleges are trying to find ways to attract more male students. Gender ratios also change depending on where you live. The Northeastern United States has a smaller male-to-female ratio than the Western U.S. In Alaska, the state with the highest male-to-female ratio, there are 107 men for every 100 women.

See for yourself: http://www.cbsnews.com/8301-3445_162-57454755/as-gender-roles-change-are-men-out-of-step/

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Watch the following videos to learn about skewed gender ratios in family media, school sports, and the teaching profession.




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Image Attributions

  1. [1]^ Credit: Beverley Goodwin; Source: http://www.flickr.com/photos/37390607@N02/10014783096; License: CC BY-NC 3.0
  2. [2]^ Credit: John Walker; Source: http://www.flickr.com/photos/8047702@N07/4608963722/; License: CC BY-NC 3.0

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