The cost of 40 pens is k. 360 and the cost of 30 pencils is k. 90. The ratio of the cost of a
pen to that of a pencil is
A. 1:3 B. 1:4 C. 3:1 D. 4:1 E. 16:3
- The ratio of the area of a circle of radius 7 cm to the area of a circle of radius 14 cm is
A. 1:2 B. 2:3 C. 3:5 D. 4:9 E. 1:4 - If the ratio of the areas of two circles is 49:25 , then the ratio of the diameters of these
circles is
A. 3:4 B. 4:5 C. 7:5 D. 6:5 E. 1:4 - If x is 2/3 of y and y is 3/4 of z , then the ratio of z to x is
A. 2:1 B. 1:1 C. 3:2 D. 1:2 E. 4:3 - If 2x2 -5xy + 3y2=0, then x:y=……….
A. 2:5 B. 5:3 C. 1:1 D. 1:1 (or) 2:3 E. 3:2 (or) 1:1 - If xy = x + y, where x and y are real numbers, then y cannot be
A.0 B.1 C. -1 D.2 E. -2 - If 3a = 4b = 5c, then 1/a:1/b:1/c =…………
A.(4/2)^2 B. (2/3)^2 C. 32 D. (3/4)^2 E.(1/3)^2 - A quadratic equation with roots -3 and 5 is
A.x2-15=0 B. x2-8x-15=0 C.x2+8x-15=0 D. x2+2x-15=0 E. x2-2x-15=0 - A quadratic equation with solution set {1/3,1/4} is
A.12x2=7x+1 B.12x2=7x-1 C.12x2=x+1 D.12x2=x-1 E.12x2=1-x - The solution set of the system of equation x-y=3, x2-y2=21 is
A.{(2,5)} B.{(5,2)} C. {5,2} D.{(2,5),(5,2)} E. None of these
14.The solution set of the system of equation x-y=0,x2+y2=8 is
A.{(2,-2),(-2,2)} B.{(-2,2),(2,-2)} C.{(2,2),(-2,-2)} D.{(