Question

In a certain country, the life expectancy of a woman born in 1995 was 80.2 years. Between 1995 and 2005, the life expectancy increased 0.4 year every 5 years.

Answer 1

Life expectancy of woman in
`2005=81` years

Explanation:

Life expectancy in
`1995=80.2` years

In every
`5` years increase in life expectancy
`=0.4`

So per year increase =
`(Increase\ in\ 5\ years)/(5)`

`=(0.4)/(5)`

Total years between
`1995` and
`2005=2005-1995=10`

Increase in
`10` years = increase in
`1` years
`*10`

`=(0.4)/(5)*10\\=0.4*2\\=0.8\ years`

So life expectancy of woman in
`2005`

`=80.2+0.8\\=81\ years`