A girl has brother and sister.she has as many brothers as she has sisters.her brothers twice as many sisters as he has brothers.How many children?请看补充!A girl has brothers and sisters.she has as many brothers as she has sisters.her brothers
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A girl has brother and sister.she has as many brothers as she has sisters.her brothers twice as many sisters as he has brothers.How many children?请看补充!A girl has brothers and sisters.she has as many brothers as she has sisters.her brothers
A girl has brother and sister.
she has as many brothers as she has sisters.
her brothers twice as many sisters as he has brothers.
How many children?
请看补充!A girl has brothers and sisters.
she has as many brothers as she has sisters.
her brothers twice as many sisters as he has brothers.
How many children?
A girl has brother and sister.she has as many brothers as she has sisters.her brothers twice as many sisters as he has brothers.How many children?请看补充!A girl has brothers and sisters.she has as many brothers as she has sisters.her brothers
suppose x girls and y boys
x-1 = y
x= 2*(y-1)
x= 4
y= 3
x+y =7
There are 7 children
3个,2女一男