Question

Suppose you send about 8 text messages a day, and your older sister sends more text messages than you do. Together, you send a total of about 21 messages per day. About how many text messages does she send a day? Write an equation that contains the unknown value, x, and solve for the unknown value

Answer 1

21-8=x, x=13

Explanation:

If she send more than you, you have to subtract your messages from the total messages, getting her total messages.