model 7 average on ages/weight Practice Questions Answers Test with Solutions & More Shortcuts

Question : 6 [SSC CGL Tier-I 2010]

In a family, the average age of a father and a mother is 35 years. The average age of the father, mother and their only son is 27 years. What is the age of the son ?

a) 11 years

b) 12 years

c) 10 years

d) 10.5 years

Question : 7

The average age of 8 men is increased by 2 years when two of them whose age are 21 and 23 years replaced by two new men. The average age of the two new men is

a) 24 years

b) 22 years

c) 30 years

d) 28 years

Question : 8 [SSC CGL Tier-I 2013]

In a family of 5 members, the average age at present is 33 years. The youngest member is 9 years old. The average age of the family just before the birth of the youngest member was

a) 29 years

b) 30 years

c) 24 years

d) 25 years

Question : 9 [SSC Investigator 2010]

The average age of 9 students and their teacher is 16 years. The average age of the first four students is 19 years and that of the last five is 10 years. The teacher’s age is

a) 34 years

b) 36 years

c) 28 years

d) 30 years

Question : 10 [SSC CGL Tier-II 2012]

In a school with 600 students, the average age of the boys is 12 years and that of the girls is 11 years. If the average age of the school is 11 years and 9 months, then the number of girls in the school is

a) 150

b) 450

c) 350

d) 250