8 m7999s

:3 , then 3a+ 4b: 4a+3b is
A. 27:36 B. 29:27 C. 27:29 D. 26:29 E. 17:19

1. If 2x +3y:2x+y=3:2, then x:y=……….
   A. 3:2 B. 2:3 C. 4:3 D. 3:4 E. None of them
2. 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
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
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
5. 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
6. 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
   1 C. -1 D.2 E. -2
7. If 3a = 4b = 5c, then 1/a:1/b:1/c =…………
   A. 1/3:1/4:1/5 B.1/5 :1/4: 1/3 C. 1/4:1/5:1/3 D. 3:4:5 E.5:4:3
8. If x:y:z =2:3:4 and x + y +z = 18 , then xyz = …………
   A.12 B.48 C.192 D.256 E.512
9. If (5x-4y) = 4(2x-3y) , then x : y = ……….
   A. 3:8 B. 8:3 C. 12: 17 D. 6:-13 E. 13:18
10. If x:y = 2:3 , find (x2 + y2):(x2-y2).
    A. 2:5 B. 13:-5 C.6:13 D. 6:-13 E. (9:13)
    20.Let x,y,z be three unequal numbers . Which of the following is (are) equal to x:y:z?
    1.5x: 5y : 5z 2. x+1 : y+1 : z+1 3. x2 : y2 : z2
    A.1 only B. 2 only C. 1 and 2 only D. 2 and 3 only E. 1,2 and 3