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The average income of A, B, and C is Rs. 12,000 per month and the average income of B, C and D is RS. 15,000 per month. If the average salary of D be twice that of A, then the average salary of B and C is (in Rs)

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Important Questions on Averages

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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 58
The average price of 80 computers in an electronic shop is Rs. 30,000. If the highest and lowest price computers are sold out then the average price of the remaining 78 computers is Rs. 29,500. The cost of the highest price computer is Rs. 80,000. The cost of lowest price computer is :
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 2
p, q and r are three positive numbers such that p>q>r. When the smallest number is added to the difference of the rest two numbers, then the average of the resultant number and the original numbers except to the smallest number is 21 more than the average of all the three original numbers. Find the value of p-q.
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 3
Progressive express left for New Delhi, increasing its speed in each hour. It started its journey from Lucknow, but after four hours of its journey, it met with an accident. Its speed in the fourth hour was 75 times that of the third hour and the speed in the third hour was 107 times that of the second hour and in the second hour it was 75 times that of the first hour. If it had travelled with half of the speed of the third hour, then it would have gone 160 km less in the same time. Find the average speed of the train during the journey of 4 hours.
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 5

The average age of all the 100 employees in an office is 29 years, where \( \frac{2}{5}th \) employees are females and the ratio of the average age of males to females is 5 : 7. The average age (in years) of females employees is -

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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 15
The average of 26, 29, n, 35 and 43 lies between 25 and 35. If n is always an integer and greater than the average of the given integers, then find the value of n. 
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 19
A number is such that when it is multiplied by 8, it gives another number which is as much above from 270, as the original number is below 270. Find the average of the original number and 270.
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 21
The average age of all the 20 students of a class is 24 years. The minimum age of a student is 18 years and the maximum age of another student in the same class is 30 years. When the two students, whose average age was 26 years, were restricted from the class but later on one of the restricted students was readmitted, then, find the new average age of the class.
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 22
In a set of prime and composite numbers, the composite numbers are twice the number of prime numbers and the average of all the numbers of the set is 9. If the number of prime numbers and composite numbers are exchanged, then the average of the set of numbers is increased by 2. If during the exchange of the numbers, the average of the prime numbers and composite numbers individually remained constant, then, find the ratio of the initial average of composite numbers to the initial average of prime numbers.