靖儒 發問時間: 社會與文化語言 · 1 0 年前

(急!!)GRE數學題

麻煩幫我解這幾題GRE數學

我想很久可以想不懂 謝謝!!

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答案

a) a的答案較大

b) b的答案較大

c) 兩相等

d) 無法計算

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10)

The toll for a certain bridge is $0.15 or 1 token. Tokens are sold in packs of 40 for $4.00.

a) The percent saved on 40trips across the bridge if a token, rather than $0.15, is used to pay each toll.

b) 66又2/3%

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12)

a) The average (arithmetic mean) cost per cassette for 18 cassettes costing a total of 2x dollars

b) The average (arithmetic mean) cost per cassette for 3 cassettes costing a total of x/3 dollars

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16)

If 8750 pairs of shoes are represented in the pictograph above, how many pairs of shoes does each (鞋子) represent?

a) 350 b) 700 c)730 d)830 e)1400

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30)

Two tanks, X and Y, are filled ro capacity with jet fuel. Tank X holds 600 gallons more than tank Y. If 100 gallons of fuel were to be pumped from each tank, tank X would then contain 3 times as much fuel as tank Y. What is the total number of gallons of fuel in the two full tanks?

a)1400 b)1200 c)1000 d)900 e)800

已更新項目:

hillngreen 你好

第10題

我還是不太懂 衛什麼0.15要乘以40呢?

你可以幫我家中文註解嗎?

還有第30題

BIG BOOK的答案是1400ㄝ

1 個解答

評分
  • 1 0 年前
    最佳解答

    10)

    The toll for a certain bridge is $0.15 or 1 token. Tokens are sold in packs of 40 for $4.00.

    a) The percent saved on 40trips across the bridge if a token, rather than $0.15, is used to pay each toll.

    (0.15*40-4)/6=33.333333%

    b) 66又2/3%

    12)

    a) The average (arithmetic mean) cost per cassette for 18 cassettes costing a total of 2x dollars=2x/18=x/9

    b) The average (arithmetic mean) cost per cassette for 3 cassettes costing a total of x/3 dollars=( x/3)/3=x/9

    16)

    If 8750 pairs of shoes are represented in the pictograph above, how many pairs of shoes does each (鞋子) represent?

    a) 350 b) 700 c)730 d)830 e)1400

    用8750除以pictograph上鞋子的全部數目

    30)

    Two tanks, X and Y, are filled ro capacity with jet fuel. Tank X holds 600 gallons more than tank Y. If 100 gallons of fuel were to be pumped from each tank, tank X would then contain 3 times as much fuel as tank Y. What is the total number of gallons of fuel in the two full tanks?

    a)1400 b)1200 c)1000 d)900 e)800

    x=600+y

    600+y-100=3*(y-100)

    y+500=3y-300

    y=200

    x=800

    x+y=1000

    2008-10-26 23:06:02 補充:

    走四十趟,要用四十張票,一張0.15元,所以要用6元,回數票只要4元。

    這一個是算數±弄錯了,不好意思,應該是2y=800,所以y=400 x=1000

    總共1400。

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