A statistician is compiling neighborhood
demographics for an apartment building in New
York City. She determines that there are 46 male
and female residents in the building. One month
after her census, 6 male residents move out of the
building, resulting in 3 times as many female as
male residents in the apartment building. How
many female residents were originally in the
building?
A) 16
B) 28
C) 30
D) 40