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1) If there were 10 more students in his class, Professor Garcia would have at least 50 students in his class.

Lets say total x student

so, if there were 10 more, x+10, atleast 50 students, x+10>=50, x>=40, Insufficient

option a and d are out

2) If there were 10 fewer students in his class, Professor Garcia would have at most 50 students in his class.

now, if there were 10 fewer, x-10, atmost 50 students, x-10<=50, x<=60, Insufficient,

option b is also out

if we put both 1 and two together, 40<x<60, so student can range from 40 to 60, Insufficient

hence d is out too.

only option left is E.
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consider x to be the number of students.

Statement-1:
x+10 >=50
x>=40
Thus, not sufficient
So now we'll look at the second statement
Statement-2 :

x-10<=50
x<=60
It is also not sufficient to solve the question.

so our x is in the range [40,60]
but we dont have any exact value, so both of the statements aren't sufficient.
hence, the option is E
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