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From Wikipedia
In economics and geography the dependency ratio is an agepopulation ratio of those typically not in the labor force (the dependent part) and those typically in the labor force (the productive part).
Formula
In published international statistics, the dependent part usually includes those under the age of 15 and over the age of 64. The productive part makes up the population in between, ages 15 â€“ 64. It is normally expressed as a percentage:
 (Total)\ Dependency\ ratio = \frac{(number\ of\ people\ aged\ 0\ to\ 14\ and\ those\ aged\ 65\ and\ over)} {number\ of\ people\ aged\ 15\to \ 64} \times 100
As the ratio increases there may be an increased burden on the productive part of the population to maintain the upbringing and pensions of the economically dependent. This results in direct impacts on financial expenditures on things like social security, as well as many indirect consequences.
The (total) dependency ratio can be decomposed into the child dependency ratio and the aged dependency ratio:
 Child\ dependency\ ratio = \frac{number\ of\ people\ aged\ 014} {number\ of\ people\ aged\ 1564} \times 100
 Aged\ dependency\ ratio\ = \frac{number\ of\ people\ aged\ 65\ and\ over} {number\ of\ people\ aged\ 1564} \times 100
Inverse
The inverse of the dependency ratio, the inverse dependency ratio can be interpreted as how many independent workers have to provide for one dependent person (pension & expenditure on children)
From Yahoo Answers
Answers:Both equations are balanced. This is a combination of two reactions, and balancing can be done in many different ways. Zn(OH)2 heat> ZnO + H2O and ZnCO3 heat> ZnO + CO2
Answers:[ (error  reference) / reference ] * 100 = % accuracy ~
Answers:100 * (estimate  actual)/actual = %error
Answers:One quick way is to find the square root of 2, store this number, clear the display, call the number back from memory and square it. On some calculators you'll get 1.99999998 (or something like that). I use the Golden Ratio: [1 + SQRT(5)] / 2 = 1.618034 store that while the number is still on the display, square it, then subtract it from the number in memory. The result should be exactly 1 (the Ancient Greeks knew this and they did not have calculators!) 2.618034...  1.618034... = 1 (exactly) With the same number, do 1/x you should get 0.618034... which is exactly 1 less than the Golden Ratio. Some calculators do not give exactly 1.
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