There were 32 teachers in a school and their average age is 37. Two of them retired at the age of 55 and two others of ages 21 and 25 joined in their places. What is the average age of the teachers now ?
30
32
35
40
The middle number among 13 consecutive natural numbers is 31. Find the sum of the 13 numbers ?
400
401
402
403
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 _____.
25 years
40 years
50 years
None of these
The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45 .15 kg. Find the average weight of all the boys in the class.
47.55 kg
48 kg
48.55 kg
49.25 kg
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 he spends Rs. 4000 each year ?
Rs. 7.98
Rs. 8
Rs. 8.50
Rs. 9
A grocer has sale of Rs. 6435, Rs. 6927, Rs, 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs. 6500.
Rs. 4991
Rs. 5991
Rs. 6001
Rs. 6991
John got an average of 25 coconuts from 10 coconut tree from this coconut grove. What can be the number of coconuts he got from each coconut tree ?
200
250
275
300
Average collection of April is Rs. 7973. Find the total collection of April.
Rs. 79730
Rs. 23000
Rs. 239190
Rs. 229190
A family consists of grand parents, parents and three grand children. The average age the grand parents is 67 years, that of the parents is 35 years and that of the grand children is 6 years. What is the average age of the family ?
28 4/7 years
31 5/7 years
32 1/7 years
Average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ? .
0
1
10
19