Question

Modern medical advances might mean people could live 200 years. In 2009 the life expectancy is about 80 years. Assume that due to modern advances life expectancy gains 5.5years every decade. From 2009 in how many years would humanity achieve a life expectancy of 100 years?

Answer 1

36.3 years

Explanation

1 decade= 10 years

Step 1

Let

$2009\Rightarrow80\text{ years}$

Assume that due to modern advances life expectancy gains 5.5years every decade,then

$yearx\Rightarrow100$$\begin{gathered} \text{decaces where expectative is 100 years = }\frac{100-80\text{ years}}{5.5\text{ }\frac{years}{\text{decade}}}=\frac{20\text{ yeats}\cdot decade}{5.5\text{years}}=3.63\text{ decades} \\ 3.63\text{ decades=36.3 years} \end{gathered}$

I hope this helps you