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

Question : 31 [SSC CHSL 2012]

Average age of 8 men is increased by 3 years when two of them whose age are 30 and 34 years are replaced by 2 persons. What is the average age of the 2 persons ?

a) 32 years

b) 24 years

c) 48 years

d) 44 years

Question : 32 [SSC DEO 2008]

The average age of group of 20 girls is 15 years and that of another group of 25 boys it is 24 years. The average age of the two groups mixed together is

a) 20 years

b) 19.5 years

c) 21.5 years

d) 21 years

Question : 33 [SSC SO 2003]

There are 30 students in a class. The average age of first 10 students is 12.5 years. The average age of the remaining 20 students is 13.1 years. The average age (in years) of the students of the whole class is

a) 12.7 years

b) 12.5 years

c) 12.9 years

d) 12.8 years

Question : 34

The average age of 30 boys in a class is 15 years. One boy, aged 20 years, left the class, but two new boys came in his place whose age differ by 5 years. If the average age of all the boys now in the class becomes 15 years, the age of the younger newcomer is :

a) 15 years

b) 20 years

c) 8 years

d) 10 years

Question : 35

The average age of a family of 10 members is 20 years. If the age of the youngest member of the family is 10 years, then the average age of the members of the family just before the birth of the youngest member was approximately

a) 12.5 years

b) 27.14 years

c) 11$1/9$ years

d) 14.28 years