英语翻译
ProfessorMarkwasaskedhowoldhistwochildren,PeterandPaul,were."Ican'tremember,"saidtheabsentmindedprofessor."ButIdorememberthatthedifferenceintheirageistwoyears.Andifyoumultiplytheiyage,youget120.Peteristheolderofthetwo."Howoldarethey?