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The average of thirteen numbers is 80. The average of the first five numbers is 74.5 and that of the next five numbers is 82.5. The 11th number is 6 more than the 12th number and the 12th number is 6 less than the 13th number. What is the average of the 11th and 13th numbers?

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Important Questions on Averages

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Quantitative Aptitude>Arithmetic>Averages>Averages
The average of three numbers is 58. First number is 34th of third number. If the third number is 24 more than the second number,  what will be the difference between first and the second number?
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Quantitative Aptitude>Arithmetic>Averages>Averages
The average weight of 25 objects is 50 kg. If the weight of another object X is added to it then the average weight increases by 500 g. What is the weight of X?
EASY
Quantitative Aptitude>Arithmetic>Averages>Averages
Out of the five subjects, the average marks of Suman in the first 3 subjects were 81 and the average marks in the last 3 subjects were 74. If her marks in the third subject were 65, then what were her average marks in all the subjects?
EASY
Quantitative Aptitude>Arithmetic>Averages>Averages
The average height of A, B and C is 148 cm. If the average height of A and B is 136 cm and that of B and C is 125 cm, then what is the height (in cm.) of B?
EASY
Quantitative Aptitude>Arithmetic>Averages>Averages
The average of eleven numbers is 30. If the average of the first ten numbers is 22, then what is the eleventh number?
EASY
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If the average of 31, x, 42, 39, 56, 78, 83 and 91 is 58.5, what is the value of x?
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Quantitative Aptitude>Arithmetic>Averages>Averages
The average of the scores of 18 boys in a test is 16, while the average of the total 30 students in the class is 18.1. What is the average score of the girls?
EASY
Quantitative Aptitude>Arithmetic>Averages>Averages
A goes from Point X to Point Y at a speed of 60 km/hr and comes back with a speed of 80 km/hr. What is the average speed (in km/hr) of A for going and coming back? 
EASY
Quantitative Aptitude>Arithmetic>Averages>Averages
Average height of a class of 12 students is 180 cm. The average decreases to 179 cm when the height of the class teacher is also added. What is the height of the teacher?
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Average of 8 numbers is 42. If 9 is subtracted from each number then what will be the new average?
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What is the average of first 1947 even numbers? 

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35 is the average marks obtained by 120 students. The average marks of successful candidates was 39, and that of unsuccessful candidates was 15. What is the number of successful candidates in that examination?

MEDIUM
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Average of 12 numbers is 15. If a number 41 is also included, then what will be the average of these 13 numbers?
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Average of 8 numbers is 40. The average of first three numbers is 46 and average of next two numbers is 50. If the sixth number is 6 and 10 less than seventh and eighth number respectively, then what is the value of eighth number?
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Average of 43, 57, 68, 32, 97 and x is 63. What is the value of x? 
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Quantitative Aptitude>Arithmetic>Averages>Averages
Ram's income is â‚¹100 more than that of Shyam. If the average income of Ram and Shyam is ₹850, then Ram's Income in â‚¹ is:
MEDIUM
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The average of three numbers of which greatest is 16 is 12. If the smallest is half of the greatest, the remaining number is:
MEDIUM
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An object travels 20 meters in 4 seconds and 15 meters in the next two seconds. What is the average speed of the object?

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Quantitative Aptitude>Arithmetic>Averages>Averages
45 is the average marks obtained by 30 students of a class. On checking, two errors were identified. On correction, one student obtained 45 more marks while other obtained 15 less marks. What is the average of corrected marks?
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Quantitative Aptitude>Arithmetic>Averages>Averages
The average height of the students in a class of  10 is 105cm.. If 20 more students with an average height of 120cm join the class, what will be the average height of all students?