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
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
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
x=………
A.1.2 B.1.5
C.2 D.2.5
E.3
AD= 3DB; DE:BC=?
A.1:3 B.2:3
C.3:4 D.4:5
E.4:6
LM=………
A.xz/(x+y) B.xz/(x-y)
