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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

Each month Marks phone company charges a flat fee of 12 plus 005 per minute his bill for last month was 18 how many minutes did Marty talk on the phone last Mon class=

Respuesta :

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:

[tex]\begin{gathered} \frac{6}{0.05}=\frac{0.05M}{0.05} \\ \\ 120\text{ = M} \end{gathered}[/tex]

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

ANSWER:

120 minutes

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