英语翻译

题目

英语翻译
A bag of Texas Tillie's Trail Mix contains x ounces of walnuts,15 ounces of peanuts,and20 ounces of pecans.Which of the following expressions gives the fraction of the mix that is walnuts?

答案

一包零食*有X盎司核桃,15盎司花生和20盎司山核桃.下面哪一个方程（分数）准确写出核桃所占的比例?
*得克萨斯提利牌干果.trail mix是一种坚果,果仁,水果干等混合而成的零食.