PP38討論

hijenny · 发表于 2010-7-8 17:38:15

38.5102-!-item-!-187;#058&004451

Three 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 the 3 percent grade are mixed to give x + y + z gallons of a 1.5 percent grade, what is x in terms of y and z ?

(A) y + 3z

(B) (y + z) /4

(C) 2y + 3z

(D) 3y + z

(E) 3y + 4.5z

我的解法
1/100乘以X+2/100乘以Y+3/100 乘以Z=(x+Y+Z)乘以1.5/100
得x=y+3z
請問這個解法有錯嗎?

raymondsino · 发表于 2010-7-8 17:52:03

38.5102-!-item-!-187;#058&004451

Three 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 the 3 percent grade are mixed to give x + y + z gallons of a 1.5 percent grade, what is x in terms of y and z ?

(A) y + 3z

(B) (y + z) /4

(C) 2y + 3z

(D) 3y + z

(E) 3y + 4.5z

我的解法
1/100乘以X+2/100乘以Y+3/100 乘以Z=(x+Y+Z)乘以1.5/100
得x=y+3z
請問這個解法有錯嗎?

-- by 会员 hijenny (2010/7/8 17:38:15)

这题正确答案不就是你写的这个嘛？

hijenny · 发表于 2010-7-8 18:10:25

hijenny · 发表于 2010-7-8 18:11:26

我是想問我的思考邏輯算法正確嗎
因為這題不是考古題沒得找

PP38討論

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