Question

whats the answer of the problem peter is 3 years older than his sister Anna. if times their combined age is 85 . determine Annas age

Answer 1

Anna is 41 years old.

Explanation:

Easiest way to do this is by building a equation,

Lest say Anna's age is
`x`.

Then as Peter is 3 years older than Anna Peter's age should be
`x+3`.

Then the combined ages of the two people is given as 85. So we can write an equation as,

`x+(x+3)=85`

`x+x+3=85`

`2x+3=85`

`2x+3-3=85-3` (deducting 3 from both sides of the equation)

`2x=82`

`x=41`

As we originally took Anna;s age as
`x`

We can say Anna is 41 years old.