How many of the students at Andre DoValle High School...

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How many of the students at Andre DoValle Hig School are taking French?

1) There are 1,200 students attending Andre DoValle Hig School.
2) There are 600 students tajing Spanish and 400 students taking both French and Spanish at the Andre DoValle High School.

The OA is E.

Please, can any expert explain this DS question for me? I have many difficulties to understand why that is the correct answer. Thanks.
Source: — Data Sufficiency |