※ 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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