Question

Each month Mark‘s phone company charges a flat fee of $12 plus $0.05 per minute his bill for last month was $18 how many minutes did Marty talk on the phone last Month

Answer 1

Given:

Flat fee = $12

Per minute charge = $0.05

Total bill for last month = $18

To find the number of minutes, we have the equation:

18 = 12 + 0.05M

Where M represents number of minutes

Let's solve for M:

Subtract 12 from both sides:

18 - 12 = 12 - 12 + 0.05M

6 = 0.05M

Divide both sides by 0.05:

`\begin{gathered} (6)/(0.05)=(0.05M)/(0.05) \\ \\ 120\text{ = M} \end{gathered}`

Therefore, Marty spent 120 minutes talking on the phone last month.

ANSWER:

120 minutes