word problem

Question

Customers of a phone company can choose between two service plans for long distance calls. The first plan has a
$14
monthly fee and charges an additional
$0.18
for each minute of calls. The second plan has a
$25
monthly fee and charges an additional
$0.14
for each minute of calls. For how many minutes of calls will the costs of the two plans be equal?

Answer 1

14+.18C = 25+.14C

.04C = 11

C = 11/.04 = 275 minutes per month makes both plans the same total cost