Re: [計量] 請教數學問題
※ 引述《hsingchih (請賜我GRE高分吧!!)》之銘言：
: r＝s3次方t6次方
: Column A t3(三次方)
: Column B r／1000
: Ans: C equal
這一題看不太懂^^|||
: If 55 percent of a group of people have brown hair and 80 percent
: of the same group do not have red hair, which fraction of those who do
: not have brown have red hair?
: (a) 1/4 (b)4/11 (c)4/9 (d) 5/9 (e) 4/5
: Ans: C
55%是brown hair，20%是red hair
非brown hair是45% fraction = 20%/45% = 4/9
: X and Y are integers, XY=400 and 0<X<Y
: Column A X
: Column B 20
: Ans: B is greater
: n= k+r/s ／t/v
: In the equation above, k,r,s,t and v represent positive numbers.
: Multiplying which one of these numbers by 2 will reduce the value
: of n to 1/2 of its present value?
: (a) k (b) r (c) s (d) t (e) v
: Ans: D
n要變為1/2則分母要變2倍
t/v要變兩倍，所以t要變兩倍
: A certain money market account that had a balance of $48,000
: during all of last month earned $360 in interest for the month.
: At what simple annual interest rate did the account earn interest last month?
: (a) 7% (b) 7.5% (c) 8% (d) 8.5% (e) 9%
: Ans: E
月利率為360/48000 年利率 = 月利率 * 12 = 360/4000 = 9%
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