How many brothers and sisters are there ?

@yadavundertaker mohit • 07 Nov, 2009 1 sister and 2 brothers.

@rengaraj • 08 Nov, 2009

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 • 08 Nov, 2009 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 • 08 Nov, 2009 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 • 08 Nov, 2009

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 • 09 Nov, 2009 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 • 09 Nov, 2009 Sir,
Excellent answer given.
But i didn't try mathematically, that's my mistake.
Thanks,
R.Rengaraj

@sharadha Shivakumar • 28 Oct, 2018

sir is it ok  to use co prime numbers

@Karshil Sheth • 14 Feb, 2020

I am guessing it randomly according to given situation.

So let be sisters be G and Brothers be B.

If There are 7 children, & G =2B, then for each girl there can be 4 brothers and 3 sisters.

so S1=B1,B2

 S2= B2,B3

S3=B3,B4.

So I guess answer is :3 sisters and 4 brothers.

@Divisha Madupalli • 14 Feb, 2020

no of boys is higher than girls by 1

 it is only possible when she has 2 sisters and 4 bothers.

Answer is: There are 4 sons and 3 daughters.