Re: [計量] Eight light bulbs numbered ...
※ 引述《kb8526 (韋玉齋道主)》之銘言：
: 1.
: 1
: 8 2
: 7 3
: 6 4
: 5
: Eight light bulbs numbered 1 through 8 are arranged in a circle as
: chown above. The bulbs are wired so that every third bulb, counting
: in a clockwise direction, flashes until all bulbs have flashed once.
: If the bulb numbered 1 flashes first, which numbered bulb will
: flashed last?
: (A)2 (B)3 (C)4 (D)6 (E)7
: ANS: D
順時針數
第一個-->1 然後數第三個 -->4 接下來依序是7--2--5--8--3--6
最後一個數到6就是答案
: 2. A telephone company offers a special service to customers who make
: long-distance calls. For an additional monthly charge of $8, all
: long-distance charges in excess of $16 for a month are reduced by
: 50%. If a customer has long-distance charges of $48 for one month
: without the special service, how much would the customer have served
: by using the special service?
: (A)$0 (B)$8 (C)$16 (D)$20 (E)$32
48元是他原本付的..
假如他用那個方案 需要先付8元
可以獲得50% off
所以是48/2=24
24+8=32是他用這方案需要付的錢
題目問可以省多少
所以就是原本的48減去32
答案應該是16
ANS: C
: 3. Bill's car average 15 miles to a gallon of gasoline. He can drive the
: 24-mile round trip to and from work and pay a toll of $o.40 each way,
: or he can take mass transit at $1.40 each way. If only the cost of
: gasoline and tolls is considered, at what price per gallon of gasoline
: is the cost of driving equal to the cost of taking mass transit?
: (A)$0.80 (B)$1.12 (C)1.25 (D)1.40 (E)1.80
1.4*2 = 2.8 ---> the cost of taking mass transit
設油價為X
0.4*2 = 0.8 ---> 來回toll
24/15 ---> 總共要花的gallon
(24/15)*X + 0.8 = 2.8
X = 15/12
X = 1.25 ---> C
Ans: C
應該是這樣做吧
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