In a family, each daughter has the same number of brothers as she has sisters and each son has twice as many sisters as he has brothers. How many sons are there in the family ?
A. 2
B. 3
C. 4
D. 5
Answer: Option B
Solution (By Examveda Team)
Let d and s represent the number of daughters and sons respectively.Then, we have :
d - 1 = s and 2 (s - 1) = d.
Solving these two equations, we get: d = 4, s = 3.
This Question Belongs to Competitive Reasoning >> Arithmetic Reasoning
Let brother-1
Each son has number of sisters twice to that of brothers, so the equation is-
2(B-1)= S-------(ii)
Solving the two equations (i) and (ii):
2(S-1-1) = S( replacing the value of B in equation ii by S-1)
So, S= 4 (sisters/daughters)
So, B = S-1 = 3 (sons/brothers)
Nice