let nos of male students = M, female =F

so total = M + F

stmt 1: 33% of M i.e M/3 & 20% of F i.e F/5 are transferred students form this data we cannot infer anything about total nos of male students or female students or what fraction of the students are transferred i.e we cannot relate this with total M+F
INSUFF

stmt 2: it says that (M+F)/4 = transferred students, but we cannot find the nos of Male & Female students tranferred INSUFF

combine we have

M/3 +f/5 = (M+f)/4

M/3+m/4 = f/4-f/5

7m/12 = f/20

m/f =3/35

so frcation of males =3/38

Answer should be C

m=

The answer C is correct, but the calulations further ahead have gone a bit haywire... aneways...GMAT does not count it...

(M/3) + (F/5) = (M+F)/4

(M/3) - (M/4) = (F/4) - (F/5)

M/12 = F/20

M/F = 3/5

therefore M/(M+F) = 3/8.

the answer will still remain C