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Averages 1/1

1. Average of first 10 natural numbers =
a. 5
b. 6
c. 5.5
d. 5.2


2. The average age of three boys is 15 years. If their ages are in the ratio 3 : 5 : 7, the age of the youngest boy is :
a. 9 years
b. 15 years
c. 18 years
d. 21 years


3. The average of ages of 10 persons in a club was 32. What should be the age of the new person joining in the club so as to increase the average by 4 ?
a. 68
b. 70
c. 71
d. 72


4. The average weight of the teacher and six students is 12 kg which is reduced by 5 kg if the weight of the teacher is excluded. How much does the teacher weigh ?
a. 40
b. 42
c. 36
d. 38


5. The average age of 40 students in a class is 15 years. If the age of teacher is also included, the average becomes 16 years, find the age of the teacher.
a. 50
b. 52
c. 54
d. 56


6. Average age of 9 members of a club is 29 years. If 2 more persons with the average age of 40 years have become the members of the club, find average age of all the 11 members.
a. 29
b. 30
c. 31
d. 32


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