71.
A motorist travels to a place 150 km away at
an average speed of 50 km / hr and returns at 30 km / hr. His average speed for
the whole journey in km /hr is:
a)
35
b)
37
c)
37.5
d)
40
72.
The average weight of 3 men A, B and C is 84
kg. Another man D joins the group and the average now becomes s 80 kg. If
another man E, whose weight is 3 kg more than that of D, replaces a, then the
average weight of B, C, D and E becomes 79 kg. The weight of A is.
a)
70 kg
b)
72 kg
c)
75 kg
d)
80 kg
73.
The average age of a husband and his wife was
23 years at the time of their marriage. After five years they have a one-year
old child. The average age of the family now is:
a)
19 years
b)
23 years
c)
28.5 years
d)
29.3 years
74.
There years ago, the average age of A and B
was 18 years. With C joining them, the average age becomes 22 years. How old is
C now?
a)
24 years
b)
27 years
c)
28 years
d)
30 years
75.
The average age of husband, wife and their
child 3 years ago was 27 years and that of wife and the child 5 years ago was
20 years. The present age of the husband is:
a)
35 years.
b)
40 years
c)
50 years
d)
None of these
ANSWERS
