有問有答

【救命呀！】

　網友 William 問說：

　　Peter has exactly $5 in coins in his pocket, which consist of some 5 cent, 10 cent and 25 cent (五角, 一毛, 兩毛五) He has 43 coins in total. How many choices are possible, for the numbers of each denomination of coins that Peter has in his pocket??
【中譯】
　Peter恰好有美金5元的硬幣在口袋中
，種類分別有5分，10分，25分;已知硬幣共有43個。
　請問Peter口袋中的硬幣5分，10分，25分各有多少個，有多少種可能呢？