Data Sufficiency

In a certain senior class, 72 percent of the male students and 80 percent of the female students have applied to college. What fraction of the students in the senior class are male?

1) There are 840 students in the senior class
2) 75 percent of the students in the senior class have applied to college

I don't see how 2 is sufficient without 1.

thanks!

form stat2 - 0.72m + 0.8f = 0.75(m+f)
so f=(3/5)m

now we can find the value of [m/(m+f)]*100.



Thanks!