Arturo O. answered 09/07/16
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She started with 9 and used 6, so she used 6 out of 9, which is 6/9 of the total. Now set up a proportion to convert the 6/9 to percent:
6 → 9
x → 100
x = 6 * 100 / 9 ≅ 67
She used 67% of the apples.