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Home > MC2 > Chapter 1 > Lesson 1.1.3 > Problem 1-17


Thu wants to play “Guess My Number.” She states, “When I triple my number and add five, I get twenty-six. What is my number?” What is her number? Show how you know.

To triple means to multiply by , so:

Thu's number cannot be because...

So what can her number be?

Her number is . Be sure to show why this is the answer.