A because the height and age are sometimes not proportional or ideal. Some kids don't develop due to health problems for example, which make them look smaller than normal. Other people might a conditions, which makes them grow to tall.
The ratio of boys to girls is 12:24 (which is already one statement) the ratio, simplified, is 1:2 (ratio are like fractions, which is how I was able to "simplify" it)
