摘 要: | AThere are three brothers,the eldest says:"I have four nephews(侄儿)and one niece(侄女)."The second says:"I have four nephews too,but Ihave two nieces."The third says:"I have four nephews as well(也),but Ihave three nieces."Do you know how many sons and daughters each of them has?B Mr.Wang buys a new pair of socks,however,there is a hole on each sock.
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