来自陈禹年的问题
MarshallhadtwiceasmanymarblesaeEsther.whenEsthergavehim12ofhermarbles,hethenhai120moremarblesthanher.howmanymarblesdidEstherhaveatfirst
MarshallhadtwiceasmanymarblesaeEsther.whenEsthergavehim12ofhermarbles,hethenhai120moremarblesthanher.howmanymarblesdidEstherhaveatfirst

