y※ 引述《peilinchen (peilin)》之铭言： : 图表题(真糟糕我的图表题一直是我的痛) : 1. Family X's gross income is the sum of Mr. X's income and Mrs. X's income. : In 1983 Mr. and Mrs. X each had an income of $25,000. If Mr. X's income : increased by 10 percent from 1983 to 1984, by what percent did Mrs. X's : income decrease for the same period? : (A) 10% : (B) 15% : (C) 20% : (D) 25% : (E) 30% : Ans: E 25000*1.1 +25000*(1-x)=45000 x=0.3 : 2. By approximately what percent did the amount that Family X put into : savings decrease from 1983 to 1984? : (A) 13% : (B) 23% : (C) 35% : (D) 45% : (E) 57% : Ans: E 1983: 50000*0.25=12500 1984: 45000*0.12=5400 5400-12500/12500=-0.568 : If $4,500 was invested in a bond fund when the proce per share was : $9 and #3,000 was invested in the fund when the price per share was : $10, what was the average (arithmetic mean) price per share purchased? : (A) $9.625 : (B) $9.50 : (C) $9.40 : (D) $9.375 : (E) $9.20 : Ans: D (不懂题目的意思) 5743 : n > 0 : Column A Column B : n(n+1)+n+1/(n+1)^2 1 : Ans: C n*(n+1)+n+1=n^2+2*n+1=(n+1)^2 : A rectangular rug covers half of a rectangular floor that is 9 feet wide : and 12 feet long. If the dimensions of the rug are in the same ration : as those of the floor, how many feet long is the rug? : (A) 6 : (B) 21/2 : (C) 2√7 : (D) 6√2 : (E) 4√6 : Ans: D 9*12*x^2=54 x=1/√2 12*1/√2=6√2 --

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