|
Question 38009: Phil & phyllis are siblings. phyllis has twice as many brothers
as she has sisters. phil has the same number of brothers as
sisters. how many girls and how many boys?''.
I can figure out the awnser in my head but i have no idea how to put it into a equation
Answer by psbhowmick(878)   (Show Source):
You can put this solution on YOUR website! Noun "phyllis" has been qualified with verb "she". So phyllis is girl.
Let the number of her sisters = x, then number of her brothers = 2x.
So total brothers and sisters of phyllis (including herself) = 2x + x + 1 = 3x + 1.
Note: It has not been mentioned whether phil is a girl or a boy.
First case: Let us assume that phil is boy.
Then the number of his brothers = 2x - 1 (as he himself is not included)
and the number of his sisters = x + 1 (x = no. of sisters of phyllis who herself is a girl)
As no. of sisters = no. of brothers, so 2x - 1 = x + 1 or x = 2.
Second case: Let us assume that phil is a girl.
Then the number of her brothers = 2x
and the number of her sisters = x (x = no. of sisters of phyllis who herself is a girl)
As no. of sisters = no. of brothers, so 2x = x or 1 = 2.
This is not possible.
So phil cannot be a girl.
Thus phyllis has 2 sisters and 4 brothers, making a total of 3 girls and 4 boys.
|
|
|
| |
