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

Answer:

Anna is 41 years old.

Step-by-step 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.