Re: [機經] 計量一問
※ 引述《young99 (結束即是開始)》之銘言:
: 1. Each of 200electrical switches controls a separate light bulb. How many of
: the switches are in the OFF position?
: (1) 40 percent of the bulbs are glowing.
: (2) 5 percent of the bulbs are burnt out.
: 答:E, 我知道單獨(1),(2)皆錯,但合併考慮時,從(2)的條件可以得知壞掉的數目
: (10),那剩下的皆是好的(190),再加上(1)的條件應該可得知OFF的數目了吧?
: 還是還有其他可能性?
burnt out 的5% 沒辦法確定是ON or OFF
所以答案 E
: 2.Two tanks, X and Y, are filled to 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
: 答:A,這一題我看很久,還是不知上下給的條件有何關係?
: 第一個條件: X = 600+Y
: 第二個條件: X = 3Y ; X + Y = 100。
: 請問如何解出1400這個數字啊?
: 謝謝大家
條件1. X = 600 + Y
條件2. X-100 = 3(Y-100)
兩式聯立 Y = 400 ; X = 1000
X + Y = 1400
以上個人淺見 大家討論討論 謝謝
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10/27 11:33, , 1F
10/27 11:33, 1F
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