76.
3 years ago, the average age of a family of 5
members was 17 years. A baby having been born, the average age of the family is
the same today. The present, age of the baby is
a)
1 year
b)
1 ½ years
c)
2 years
d)
3 years.
77.
10 years ago, the average age of a family of 4
members was 24 years. Two children having been born (with age difference of 2
years), the present average age of the family is the same. The present age of
the youngest child is:
a)
1 years
b)
2 years
c)
3 years
d)
5 years
78.
After replacing an old member by a new member
by a new member, it was found that the average age of five members of a club is
the same as it was 3 years ago. What is the difference between the ages of
their placed and the new members.
a)
2 years
b)
4 years
c)
8 years
d)
15 years.
79.
The average age of 3 children in a family is
20% of the average age of the father and the eldest child. The total age of the
mother and the youngest child is 39years. If the father’s age is 26 years, what
is the age of second child?
a)
15 years
b)
18 years
c)
20 years
d)
Cannot be determined
80.
The average age of a group of persons going
for picnic is 16 years. Twenty new persons with an average age of 15 years join
the group of the sport due to which their average age becomes 15.5 years. The
number of persons initially going for picnic is:
a)
5
b)
10
c)
20
d)
30
ANSWERS
