thinktank wrote:

What percent of the students at Jefferson High School study French but not Spanish?

(1) 30% of all students at Jefferson High School study French.

(2) 40% of all students at Jefferson High School do not study Spanish.

Hi,

Let us assume there are 100 students then, we have

Total= No. of students that study French (F) + No. of Students that study (S) - no. of students that study both (B) + Neither (N)

Thus we have

100= F+S-B+N

St 1 gives us F only so not sufficient

So, Option A and D ruled out

St 2 ----> F+ N = 40

Alone not sufficient, so B ruled out

Combining we get S-B = 60, We still cannot find out S and B therefore insufficent and hence ans E

Thanks

Mridul

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