26.
A car owner buys petrol at Rs. 7.50, Rs. 8 and
Rs. 8.50 per litre for three successive years. What approximately is the
average cost per litre of petrol if be spends Rs. 4000 each year?
a)
Rs. 7.98
b)
Rs. 8
c)
Rs.8.50
d)
Rs. 9
27.
The average of six numbers is X and the average
of three of these is Y. If the average of the remaining three is z, then:
a)
X = y + z
b)
2 X = Y + z
c)
X = 2y + 2z
d)
None of these
28.
Out of 9 persons, 8 persons spent Rs. 30 each for
their meals. The ninth one spent Rs. 20 more than the average expenditure of
all the nine. The total money sent by all of them was:
a)
Rs. 26
b)
Rs.290
c)
Rs. 295.50
d)
Rs.400.50
29.
The average of 50 numbers is 30. Each for their
meals. The ninth one spent Rs. 20 more than the average expenditure of all the
nine. The total money spent by all of them was:
a)
28.32
b)
28.78
c)
29.27
d)
29.68
30.
The average of five numbers is 27. If two
numbers is excluded, the average becomes 25, the excluded number is:
a)
25
b)
27
c)
30
d)
35
ANSWERS
