How old will Jack and his sister be when he is twice as old as his sister?
答案:4 悬赏:30 手机版
解决时间 2021-03-31 23:45
- 提问者网友：富士山上尢
- 2021-03-30 23:02
How old will Jack and his sister be when he is twice as old as his sister?
最佳答案
- 五星知识达人网友：怙棘
- 2021-03-30 23:34
Jack is 15 years old, three times as old as his sister.
So his sister is 5 years old.
How old will Jack and his sister be when he is twice as old as his sister?
Jack will be 20 years old and his sister 10 years old.
So his sister is 5 years old.
How old will Jack and his sister be when he is twice as old as his sister?
Jack will be 20 years old and his sister 10 years old.
全部回答
- 1楼网友：西岸风
- 2021-03-31 03:16
JACK15岁时，他的妹妹是5岁。由JACK的年龄是他妹妹的3倍得出
设经过X年后，JACK的年龄是他妹妹的两倍
15+X=2(5+X）
得出X=5
就是JACK20岁。他妹妹10岁
设经过X年后，JACK的年龄是他妹妹的两倍
15+X=2(5+X）
得出X=5
就是JACK20岁。他妹妹10岁
- 2楼网友：千杯敬自由
- 2021-03-31 01:42
when jack will be 20 years old,and his sister will be 10 years old.
- 3楼网友：愁杀梦里人
- 2021-03-31 00:56
Jack will be 20 and her sister will be 10.
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