Find the average of the first 40 natural numbers.
21
20.5
21.5
None Of These
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1
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The average of 20 students is 12 years, if the teacher's age is included, average increases by one. The age of the teacher is:
Solution 
2
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a, b, c, d, e, f, g are consecutive even numbers. j, k, l, m, n are consecutive odd numbers. The average of all the numbers is :
Solution 
3
Discuss

If the average of x and 1/x(X\( \ne \)0) is M, then the average of x2 and 1/x^{2} is :
Solution 
4
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A shop of electronic goods is closed on Monday. The average daily sales for remaining six days of a week is Rs. 15,640 and the average sale of Tuesday to Saturday is Rs. 14,124. The sales on Sunday is 
Solution 
5
Discuss

Find the average of all prime numbers between 30 and 50.
Solution 
6
Discuss

The reduction in the speed of an engine is directly proportional to the square of the number of bogies attached to it. The speed of the train is 100 km/hr when there are 4 bogies and 55 kmph when there are 5 bogies. What is the maximum number of bogies that can be attached to the train so that it can move?
Solution 
7
Discuss

The mean of 25 observations was found to be 78.4. But later on it was found that 96 were misread as 69. The correct means is
Solution 
8
Discuss

The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. The age of the teacher (in years) is :
Solution 
9
Discuss

The mean weight of 100 students in a class is 46 kg. The mean weight of boys is 50 and of girls is 40 kg. Therefore, the number of boys is:
Solution 
10
Discuss

The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is
Solution 
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