Bunuel
How many of the students at Andre DoValle High School are taking French?
(1) There are 1,200 students attending Andre DoValle High School.
(2) The are 600 students taking Spanish and 400 students taking both French and Spanish at the Andre DoValle High School.
We need to find the number of students at Andre Dovalle High School who are taking French.
Let’s consider the two set venn diagram

Statement 1:
(1) There are 1,200 students attending Andre DoValle High School.
There were a total of 1200 students who are attending the school. We don’t know exactly how many attend taking French or Spanish.
Hence,
insufficient.
Statement 2:
(2) The are 600 students taking Spanish and 400 students taking both French and Spanish at the Andre DoValle High School.
b+ c = 600 students
b = 400 students.
c = 200.
Since, we cannot find the value of a ( French alone ).
Hence,
Insufficient Combining, both statements 1 and 2, we get
a+b+c+d = 1200
b+c = 600
therefore, a+d = 600
a and d can take any values.
Hence,
Insufficient
Option E. Attachment:
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