suppose x girls and y boys
x-1 = y
x= 2*(y-1)
x= 4
y= 3
x+y =7
There are 7 children
A girl has brother and sister.
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?
請看補充！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?
she has as many brothers as she has sisters.
her brothers twice as many sisters as he has brothers.
How many children?
請看補充！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?
英語人氣：388 ℃時間：2020-03-28 09:01:00
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