还没有登录哦!

[Problem Solving]

试题详情

题目:

Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of the mixture is X?

选项:

A、10%
B、
C、40%
D、50%
E、

答案:

B

提问:

溶质问题,请问老师这个问题怎么解? X=0.4r+0.6b Y=0.25r+0.75f X+Y=0.3r+?

解答:

点赞0
阅读1000
解答: sysadmin

提问:

溶质问题,请问老师这个问题怎么解? X=0.4r+0.6b Y=0.25r+0.75f X+Y=0.3r+?

解答:

点赞0
阅读1001
解答: sysadmin老师

问个问题

点我领取
免费专项课程
在线咨询