Final answer:
By calculating the cost per text message, which is $0.05, we determine that Ximena could send 49 text messages for $2.45.
Step-by-step explanation:
To determine how many text messages Ximena sent if she spent $2.45, we need to first understand the cost per text message based on the information provided. We know that it cost Ximena $3.40 to send 68 text messages. To find the cost per text message, we divide $3.40 by 68 text messages, which gives us $0.05 per text message.
Once we have the cost per text message, we can find out how many messages she could send for $2.45 by dividing $2.45 by the cost of each text message ($0.05).
$2.45 ÷ $0.05 = 49 text messages
Hence, Ximena could send 49 text messages for $2.45.