作业帮大家来做英语题David ,Lily ,John and Maria are 12,11,10,10and9 years
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大家来做英语题
David ,Lily ,John and Maria are 12,11,10,10and9 years old,but not in that order.
David is 2 years younger than John.
Lily is 2 years younger than Jane.
Maria is older than David.
Who are the twins?
David ,Lily ,John and Maria are 12,11,10,10and9 years old,but not in that order.
David is 2 years younger than John.
Lily is 2 years younger than Jane.
Maria is older than David.
Who are the twins?
Lily and Maria
David is 2 years younger than John,so David and john are nor twins.
And because John is 2 years older than David,so John is 12 or 11,so John cannot be one of the twins.
As the same reason,Jane is 2 years older than Lily,so Jane cannot be one of the twins.
Maria is older than David,so Maria is not 9 years old.And she cannot be 12 or 11,either(because David and Jane must be 12 and 11),so Maria is 10,David is 9,and Lily is 10
so Lily and Maria are the twins
David is 2 years younger than John,so David and john are nor twins.
And because John is 2 years older than David,so John is 12 or 11,so John cannot be one of the twins.
As the same reason,Jane is 2 years older than Lily,so Jane cannot be one of the twins.
Maria is older than David,so Maria is not 9 years old.And she cannot be 12 or 11,either(because David and Jane must be 12 and 11),so Maria is 10,David is 9,and Lily is 10
so Lily and Maria are the twins
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