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At the end of each term, Mr Chen gives scores in reading and writing to each student in his English class. These two scores are then added together to give an overall score in English for the term (for example, a student with scores of 30 in reading and 40 in writing would have an overall score of 70 in English). Last term, Sara and Mila got the same overall score in English.

If the information in the box is true, whose reasoning is correct?