My daughter has as many sisters as she has brothers. Each of her brothers has twice as many sisters as brothers. How many sons and daughters do I have?
Four daughters and three sons. Each daughter has 3 sisters and 3 brothers, and each brother has 2 brothers and 4 sisters.
To figure it out mathematically, you could use the following two equations where G = the number of girls and B = the number of boys:
G – 1 = B
2(B – 1) = G
Solving for G gives you 4 and plugging that in to G – 1 = B gives you a B of 3.
It is 4 daughters and 3 sons. It cannot be 2 daughters and 1 son because the son has to have twice as many sisters as brothers. 2*0(he has no brothers) is 0, therefore this will not work. Whereas with 4 daughters and 3 sons, one daughter will have the same amount of sisters and brothers (3), and one son will have twice as many sisters as brothers. 2*2(he has 2 brothers) is 4, the correct amount of sisters he has. Therefore, the correct amount is 4 daughters and 3 sons.
It could be 2 daughters 1 son and just because 0x2=0 that’s not the question. If I’ve been skydiving twice and you’ve never been, I’ve still been skydiving twice as many times as you….
10 Comments on "Sisters and Brothers"
Ajay says
December 2, 2015 @ 08:12
4
Adithya says
February 21, 2016 @ 05:39
4
Chloe says
February 22, 2016 @ 06:46
3boys & 4girls ??? ?
Chloe says
February 22, 2016 @ 06:46
7
sakshi singh says
June 22, 2016 @ 06:57
Answer is 7
Mhd mhd says
July 11, 2016 @ 12:15
answer is :
2 daughters & 1 son
Dinesh Bhimsaria says
October 21, 2016 @ 03:08
One son and two daughters.
GraceyCakes says
November 23, 2016 @ 10:43
It is 4 daughters and 3 sons. It cannot be 2 daughters and 1 son because the son has to have twice as many sisters as brothers. 2*0(he has no brothers) is 0, therefore this will not work. Whereas with 4 daughters and 3 sons, one daughter will have the same amount of sisters and brothers (3), and one son will have twice as many sisters as brothers. 2*2(he has 2 brothers) is 4, the correct amount of sisters he has. Therefore, the correct amount is 4 daughters and 3 sons.
ZW says
July 25, 2018 @ 20:49
Couldn’t the answer also be 2 daughters and 1 brother?
My daughter has as many sisters as she has brothers.
(If it was 2 daughters, 1 brother, still true— making “my daughter” having 1 sister, 1 brother)
Each of her brothers has twice as many sisters as brothers. How many sons and daughters do I have?
(If it was 2 daughters, 1 brother, still true bc her brother would have 2 sisters and 0 brothers making it 2x as many sisters as brothers)
ZW says
July 25, 2018 @ 20:51
It could be 2 daughters 1 son and just because 0x2=0 that’s not the question. If I’ve been skydiving twice and you’ve never been, I’ve still been skydiving twice as many times as you….
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