## Mad Ade's Bookshop Visit
When Mad Ade and his friend Barmy Bob visited the local Madadian bookstore, they took with them their nephews Crazy Carl and Dippy Derek.
They all purchased some books that cost a whole amount in Madadian Wonks. When they leave the bookshop, they notice that both uncles have spent 21 Wonks more than their respective nephews. Moreover, each of them paid per book the same amount of Wonks as books that he bought. The difference between the number of books between Mad Ade and Crazy Carl is five. Who is the uncle of Dippy Derek? ## What Next?
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