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?
人气：332 ℃ 时间：2020-03-28 09:01:00
解答
suppose x girls and y boys
x-1 = y
x= 2*(y-1)
x= 4
y= 3
x+y =7
There are 7 children
推荐
- 英语数学题：
- Given the 100 students in the Springdale High School senior class,38 students are taking math,45 students are taking psy
- Two numbers are in the tatio 2:3.When 4 is added to each number the ratio changes to 5:7.
- 急,
- 小明带了50元上街买文具,请你估计一下,尽可能把50元用完,小明大约能买到那些物品.（估出1至2种情况即可） 钢笔 12.9元 圆珠笔 5.6元 日记本 8.4元
- 同源三倍体得到平衡配子的机会很低,请问得到平衡配子（2n或n)的概率是为什么是1/2的n-1次方?
- 若正三棱锥地面三角形的边长为1,侧棱长都是2,（1）求此三棱锥的体积和表面积
- 3圆上有10个点,连接圆上任意两点的连线,交点在圆内的个数最多是几个
猜你喜欢
