Your child's answer of 200 oranges is correct.

If 30% of the oranges were bad and there were 60 bad oranges, then the total number of oranges bought would be:

60 / 0.30 = 200

Therefore, your child's answer of 200 oranges is correct. The answer of 18 oranges provided by the teacher is not correct. It's possible that the teacher made a mistake in their calculations. It's important to address this with the teacher so that they can correct the mistake and provide accurate information to their students in the future.
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