kalaydwar

The mean of a , 5a, 9a is 15. The mean of a, 3a, 5a, 7a is
A.4 B.6 C.9 D. 12 E.15

1. The mean of 27 numbers is x. If each of 27 numbers is increased by 81 , the increase in the
   mean is
   A. 3 B. 9 C. 27 D. 81 E. x

2. The mean height of 6 boys is 4´2´´ . The mean height ot 4 girls is 3´9´´ .The mean height of
   combined 6 boys and 4 girls is
   Similarity
   1.A,P,B and C,P,D are collinears,
   then the value of x is
   A.10 B.12 C.15
   D.18 E.21

3. x=………
   A.1.2 B.1.5
   C.2 D.2.5
   E.3

4. AD= 3DB; DE:BC=?
   A.1:3 B.2:3
   C.3:4 D.4:5
   E.4:6

5. LM=………
   A.xz/(x+y) B.xz/(x-y)