Answer:
Option C.
Explanation:
It is given that Megan has 25 phone numbers stored in her cell phone.
Let n be the number of phone numbers Abby has stored in her cell phone.
Total number of cell phones together they have is the sum of number of phones Megan has and number of phones abby has.
Total number of cell phones =
![25+n](https://img.qammunity.org/2019/formulas/mathematics/middle-school/abxtwy5lsnnr94gcs8v06o4tq1iwk33u5r.png)
It is given that together they have a total of 61 phone numbers stored.
![25+n=61](https://img.qammunity.org/2019/formulas/mathematics/middle-school/5qgicynmjc4jwqstu002tikgsa3lrwl0cu.png)
It can be written as
![n+25=61](https://img.qammunity.org/2019/formulas/mathematics/middle-school/yunjlonh2z3t4idep20ok922mn0hlt8q1i.png)
Therefore, the correct option is C.