Math problem

Question

Customers of a phone company can choose between two service plans for long distance calls. The first plan has a $25 monthly fee and charges an additional $0.15 for each minute of calls. The second plan has a $29 monthly fee and charges an additional $0.11 for each minute of calls. For how many minutes of calls will the costs of the two plans be equal?

Answer 1

Let m = # minutes used in a month

 

Plan 1:  .15m + 25

Plan 2:  .11m + 29

 

These are the cost equations.

Set them equal and solve for m

 

.15m + 25 = .11m + 29