math linear equations

Question

Julia's text messaging plan costs 10$ for the first 700 messages and 10 cent for each additional text message. If she owes $30.30 for text messaging in the month of June, how many text messages did she send that month?

Answer 1

Since we know that she paid $10 for the first 700 messages let's subtract that from the total.

$30.30 - $10 = $20.30

This shows that she paid $20.30 in additional charges.

We know that it cost 10¢ per text.

Take $20.30 / 10¢ to see how many texts it would take to cost that much extra money.

We get 203 texts.

Add that to the original 700 messages she paid $10 for and we get a total of 903 messages sent in June.

Hope that helps!