The correct answer is 17 hours
Here’s how you solve it!
First you would want to find how much she makes per hour so divide it
252➗12= 21
She makes $21 per hour
Then divide 357 with 21 and you would get 17
To check your answer you can do 17✖️21 and you would get 357
She would have to work 17 hours to make $357
Hope this helps! :3