little tina 發問時間: 教育與參考考試 · 1 0 年前

一題看不懂的英文數學問題

問題1:

A contractor combined x tons of a gravel mixture that contained 10 percent gravel G, by weight, with y tons of a mixture that contained 2 percent gravel G, by weight, to produce z tons of a mixture that was 5 percent gravel G, by weight. What is the value of x ?

(1) y = 10

(2) z = 16

我不知道我這樣算對嗎?

x tons →0.1G

y tons →0.02G

z tons→0.05G

(1) y=10 代入10→0.02G , G=500

所以 x=0.1*500 =50

因為我有點不懂題目的意思?

請幫忙謝謝

1 個解答

評分
  • 釋塵
    Lv 7
    1 0 年前
    最佳解答

    題目的大概意思是說,一個承包商在進行混合的工作,其中有兩份材料,一份是x噸的石渣(內含10% gravel G),另一份為y噸的石渣(內含2% gravel G),現在要混合成z噸的石渣(gravel G的成份為 5%),根據題目條件,去算出x的可能值

    (1)

    當y = 10時

    x*0.1 + 10*0.02 = (x+10)*0.05

    由此可得x = 6…………(解答)

    (2)

    當z = 16時

    x*0.1 + (16-x)*0.02 = 16*0.05

    由此可得x =6…………(解答)

    希望沒有誤解題意!!

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