The average of x number is y and average of y numbers is x. Then the average of all the numbers taken together is
(x+y)/2xy
2xy/(x+y)
(x^{2}+y^{2})/(x+y)
xy/(x+y)
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#  Quiz 

1
Discuss

The present age of a father is 3 years more than three times the age of his son. Three years hence, father's age will be 10 years more than twice the age of the son. The father's age is :
Solution 
2
Discuss

The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of P is
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3
Discuss

A set A consists of integers 27, 28, 30 and 33. If integer k is included in the set, the average of set A will increase by 30%. What is the value of integer k ?
Solution 
4
Discuss

A cricketer has a certain average for 9 innings, In the tenth inning he scores 100 runs there by increasing his average by 8 runs. His new average is
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5
Discuss

Find the average of the following sets of scores:385, 441, 876, 221, 536, 46, 291, 428
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6
Discuss

Nine persons went to a hotel for taking their meals. Eight of them spent Rs. 12 each on their meals and the ninth spent Rs. 8 more than the average expenditure of all the nine. What was the total money spent by them.
Solution 
7
Discuss

The average of the first five multiples of 3 is
Solution 
8
Discuss

If the mean of 4 observations is 20, when a constant 'c' is added to each observation, the mean becomes 22. The value of c is :
Solution 
9
Discuss

The average of six numbers is 3.95. The average of two of them is 3.4, while the average of the other two is 3.85. The average of the remaining two numbers is :
Solution 
10
Discuss

Find the average of 1.11, 0.01, 0.101, 0.001, 0.11 = ?
Solution 
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