Kipta fun with friends

There were four friends in Abir's house.
Then Abir asked his wife to make tea.
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Abir's wife called Abir in the kitchen and said: - Sugar is the last, not a single leaf, how to make tea?
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Abirah - You make tea, I'll manage the rest.
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Abir's wife served as a tea maker.
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Then Abir said: - Friends, we will play a fun game today. Sugar in a cup of these 4 tea cups
Not to be given, everyone will take a cup from here and whose cup will not be sugar
He will take us all to a big restaurant on Tuesday next to a big restaurant.
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Then after questioning the tea, everyone accepted that their sugar was right.
And one person says that: - Did you give me double sugar in my cup?