真题汇总:2007年11月23日gre数学真题部分.

　　Friday, November 23, 2007

　　1. If 0.8 is the probability that a person gets infected with the disease amongst a group, in which a person in a group is infected.

　　Col A : the probablity that a person getting infected if none of the others among the group is infected.

　　Col B : 0.4

　　Ans: D

　　2. Given Users of mixers are 14% and Users of AC&aposs are 27%. Find the Range of users excluding the users of mixers and ACs.

　　A) 41% to 59%

　　B) 59% to 73%

　　C)21% to 41%

　　Ans: B

　　3. A price of product x is increased by p% to give new price y and then price of y is reduced by r% to give original price.

　　Col A: p

　　Col B: r

　　Ans: D

　　4. Bryan and Kathleen live 150 miles apart. They each drive toward the other&aposs house along a straight road connecting the two, Bryan at a constant rate of 30 miles per hour and Kathleen at a constant rate of 50 miles per hour. If Bryan and Kathleen leave their houses at the same time, how many miles are they from Bryan&aposs house when they meet?

　　A) 40

　　B) 51.5

　　C) 56.25

　　D) 75

　　E) 93.75

　　Ans: C

　　5.The area of rectangular region R is equal to the area of rectangular region T. The Ratio of the length to the width of R is 3 to 1. the length & width of T are 12 & W, respectively.

　　Col A : w

　　Col B : 4

　　Ans: D

　　6. (0.5)^-2 , (0.5)^-1 , (0.5)^0 , (0.5)^1 , (0.5)^2. Find the range of the above numbers

　　Ans: 3.75

　　7.Two semicircles with thier diameters coincident...outer semicircle has diameter 12 feet and inner semicircle has diameter 8 feet.The outer minus inner was painted with green paint at some cost per sq feet and the inner was painted with red at the same cost per sq feet.

　　Col A: cost of green paint

　　Col B: cost of red paint

　　Ans: A

　　8. A label of vertical width w is stick on a cylinderical vessel with area A(some number) and height 10cm.

　　Col a: w

　　Col b: 4.5

　　Ans: D