问题标题:
发个英语题玩玩:Ifitweretwohourslater,itwouldbeIfitweretwohourslater,itwouldbehalfaslonguntilmidnightasitwouldbeifitwereanhourlater.Whattimeisit?
问题描述:

发个英语题玩玩:Ifitweretwohourslater,itwouldbe

Ifitweretwohourslater,itwouldbehalfaslonguntilmidnightasitwouldbeifitwereanhourlater.Whattimeisit?

姜小光回答:
  21点就是晚上九点   x+2+y=24   x+1+2y=24   y=1   x=21
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