Answer:
[tex]b + s = 25[/tex]
Step-by-step explanation:
We are going to call:
b as the age of the brother
s as the age of the sister
The sum of the ages of a brother and sister is 25. Give an equation that represents this statement using b as the age of the brother and s as the age of the sister.
Our variables are b and s and their sum is 25.
So
[tex]b + s = 25[/tex]