How many brothers and sisters are there ?

Replies

• 

  yadavundertaker mohit

  1 sister and 2 brothers.
• 

  rengaraj

  yadavundertaker

  1 sister and 2 brothers.

  Sir,
  Can it be 2 sister and 4 brother ???
  Since they specified as many sisters.
  Please Suggest.
  R.Rengaraj
• 

  yadavundertaker mohit

  what i think is that the question is not correct or i am unable to get it ...lets try it mathematically step by step
  
  Let no. of brothers =x
  
  Let no. of sisters =y
  
  Acc. to Ist condition
  
  x-1=y
  
  Acc. to 2nd condition
  
  y-1=2x
  
  putting value of x in 2nd from Ist
  
  y-1=2(y+1)
  
  y=-3 which is not possible
  
  then value of x is = -2 again it is not possible ...
• 

  yadavundertaker mohit

  if the 2nd condition means each sister has double the sister as many as brother then we can solve this question
  
  then 2nd condition becomes
  
  2(y-1)= x
  
  putting value of x from Ist equation to 2nd
  
  2(y-1) =y+1
  
  y= 3
  
  then x = 4
  
  No. of brothers =4
  
  No. of sisters =3
• 

  yadavundertaker mohit

  rengaraj

  Sir,
  Can it be 2 sister and 4 brother ???
  Since they specified as many sisters.
  Please Suggest.
  R.Rengaraj

  
  there cann't be 2 sisters if there are 4 brothers because according to the Ist each brother has same no. of sisters and brothers .And acc. to your answer each brother has 3 brothers and 2 sisters....
• 

  Saandeep Sreerambatla

  The answer should be 3 sisters and 4 brothers.
  
  
  Cond1 - Each brother has as many sisters as brothers.
  
  So considering s1,s2,s3 and b1, b2,b3 and b4
  Each of the b1 to b4 has 3 sisters and 3 brothers.
  
  Cond2- Each girl has twice as many brothers as sisters
  
  So now s1 has 2 sisters and 4 brothers.
  
  similarly s2 and s3 also.
  
  The answer is 3s and 4b..
  
  
  Its not 1s and 2b because according to second condition there should be more than 1 girl.
• 

  rengaraj

  Sir,
  Excellent answer given.
  But i didn't try mathematically, that's my mistake.
  Thanks,
  R.Rengaraj
• 

  sharadha Shivakumar

  sir is it ok  to use co prime numbers