求助PRER数学

麦兜woo · 发表于 2010-10-19 22:29:11

These grades of milk are 1 percent, 2 percent and 3 percent fat by volume. If X gallons of the 1 percent grade,Y gallons of the 2 percent grade, and Z gallons of thr 3 percent gade are mixed to give X+Y+Z gallons of a 1.5 percent grade, what is X in terms of Y and Z？答案是Y+3Z，怎么来的呢？题目意思有点不明白？

sorrymrj · 发表于 2010-10-19 22:46:53

0.1x+0.2y+0.3z=(x+y+z)*0.15
然后解出来就是了

麦兜woo · 发表于 2010-10-20 09:47:59

0.1x+0.2y+0.3z=(x+y+z)*0.15
然后解出来就是了

-- by 会员 sorrymrj (2010/10/19 22:46:53)

原来时这样哦，O(∩_∩)O谢谢

求助PRER数学

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