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[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:

想请教下这题应该用什么方法才能快速做出来哇?我用了TT图方法没解出来,看课本答案看不太懂。求解法。

解答:

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阅读894
解答: 徐小梅

提问:

想请教下这题应该用什么方法才能快速做出来哇?我用了TT图方法没解出来,看课本答案看不太懂。求解法。

解答:

点赞1
阅读895
解答: 徐小梅老师

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