For his long distance phone service, Aldo pays a $3 monthly fee plus 11 cents per minute. Last month, Aldo's long distance bill was $18.73. For how many minutes was Aldo billed?

Answer 1

B=3+.11m

18.73=3+.11m

-3 -3

15.73=.11m

143=m

Aldo was billed for 143 minutes.