### Home > MC1 > Chapter 1 > Lesson 1.1.2 > Problem1-14

1-14.

Maria was playing a game with her brother. She said, "I'm thinking of a number. When you multiply my number by six and add seven you get $\textit{25}$. What is my number?" Find Maria's number.

How big do you expect her number to be?
Can you think of a reasonable number to try?

Pick a reasonable number and try Maria's steps. Let's try $2$. If Maria multiplies this number $(2)$ by $6$, she would get $12$, then, adding $7$, she would get $19$.

Can you think of a number that might work better? Try it!

Since $19$ is smaller than $25$, let's choose a bigger number. Let's try $3$. If Maria multiplies $3$ by $6$, she would get $18$. Adding $7$, she would get $25$. Since Maria gets $25$ by using this number, $3$ is the number she described.

We now know that Maria's number is $3$.