Think Like a 3rd Grader

We've been homeschooling this year (which decision we made when Grace began reading in Italian only), and Freeman answered a math question just as a 3rd grader should have. I thought you'd enjoy his thought process.

Here's the problem:

"Brenda had 9 nickels in her pocket. She gave 3 nickels to her sister. Write a question for this story."

(the answer should be something like: How many nickels did Brenda have left in her pocket?)

Freeman wrote:
"Why did Brenda give 3 nickels to her sister?"