Answer:
Explanation:
First let's look at the operation that the teacher asked Cindy
- Subtract 3 from a certain number
Let's call the certain number X


Now let's see the operation that Cindy did

- Divided the result by 3, giving an answer of 34

From the operation that Cindy did we can clear the value of x

Now we substitute the value of x obtained in the operation that the teacher said to find the answer if she had worked the problem correctly.
