GRE 最新练习题二 SECTION Time – 30 minutes 30 Questions 2(8-7) 2(7-8) The three small rectangles have the same dimensions x+y=2 x y + 7 PS RS 1 In a certain city, 20ºF was the average (arithmetic mean) of the low temperatures of xºF, 25ºF, and 37ºF on three consecutive days 10 x m= 4x + 4y, x ≠ -y x 2m x+ y 11 On Elm Street there are houses on one side of the street and houses on the other Each pair of houses on Elm Street is connected by exactly one telephone line The total number of such lines that connect houses on opposite sides of Elm Street 12 12 ABCD is a rectangle with diagonals AC and DB r+u+v r+u+v+w n is a positive integer 13 n 100 100 f(t) = kt for all t, where k is a constant, and The area of triangular region OPQ The area of triangular region ORS f(3) = 14 (0.01)(0.07)(70) k 100x