Kathi starts with a number . she adds 3 to her number, then doubles the result. finally , she subtracts 7. if she ended with 9, what number did she start with ?

 The required number is 5.

Step-by-step explanation:  Given that Kathi starts with a number, she adds 3 to her number and then doubles the result. Finally , she subtracts 7 and she ended with 9.

We are to find the number.

Let n represents the required number.

Then, according to the given information, we have

Thus, the required number is 5.

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step-by-step explanation: