Problema Solution
It costs a flat fee of $3.15 to make an international call plus $0.05 for every minute that you talk. If you were charged $5.10 for making an international call, for how many minutes did you talk?
Answer provided by our tutors
Let
x = the number of minutes spent talking
Total Cost = Flat Fee + Charge per Minute * Number of Minutes
5.10 = 3.15 + 0.05x
3.15 + 0.05x = 5.10
........
click here to see the equation solved for the number of minutes x
........
x = 39 min
The phone talk lasted 39 minutes.