1) The average of three number is 42. If the numbers are in the ratio of 3:2:1 , the smallest number is

(a)36

(b)24

(c )21

(d)24

c

2) Average of 11 numbers 42. On including twelfth number the average becomes 45. The twelfth number is

(a)48

(b)72

(c )75

(d)78

d

3) The average of first 61 natural numbers is

(a)30

(b)30.5

(c )31

(d)None

c

4) A man arrives to his office at 60km/h and returns home along the same route at 30km/h. Find the average speed?

(a)50km/h

(b)45km/h

(c )30km/h

(d)40km/h

d

5) The average of three items of furniture is Rs. 15000. If their prices are in the ratio 3:5:7 the price of the cheapest item is:

a)Rs 9000

b)Rs.15000

(c )Rs 18000

(d)Rs 21000

a

6) A cricketer has certain average for 9 innings. In the 10th inning he scores 100 runs, there by increasing his average by 8 runs. His new average is?

a)20

b)24 runs

(c )28 runs

(d) 32 runs

c

7 )The average of three numbers is 20. If two numbers are 18 and 20 , the third is:

(a)22

(b)20

(c )19

(d)18

a

8) The average weight of 24 students of section A of a class is 58 kg whereas the average weight of 26 students of section B of the same class is 60.5 . Find the average weight of all the 50 students of the class?

(a)59.3

(b)60.3

(c )79.3

(d)49.3

a

9) The average of eight numbers is 14. The average of six of these numbers is 16. The average of the remaining two numbers is:

(a)6

(b)12

(c )8

(d)10

c

10) The average weight of 10 men is increased by 2 kg when one of the men who weighs 45 kg is replaced by a new man. The weight of the new man is;

(a)75kg

(b)80kg

(c )74kg

(d)65 kg

d