If m + n means m is sister of n,
m - n means m is brother of n,
m x n means m is daughter of n,
m ÷ n means m is mother of n,
How many females can be shown by the given relationship?
$$a + b - c + d - e \times f$$
a+b: a is the sister of b
b-c: b is the brother of c
c+d: c is the sister of d
d-e : d is the brother of e
e*f: e is the daughter of f.
We can state that a(female), b(male),c(female), d(male), e (female), f(male or female).
Hence D is the correct answer.
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