The average of two numbers is XY. If one number is X, the other is
Y/2
Y
2XY  X
X (Y  1)
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1
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The average sale of car dealership was 15 cars per week. After a promotional scheme the average sale increased to 21 cars per week. The percentage increased in the sale of cars was
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2
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The average (arithmetic mean) of 330, 360 and 390 is :
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3
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The average of x number is y and average of y numbers is x. Then the average of all the numbers taken together is
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4
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The average weight of 10 oarsmen in a boat is increased by 1.5kg when one of the crew who weighs 58kg is replaced by a new man.
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5
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The average of first five multiples of 3 is:
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6
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If the average of 5 consecutive integers is x then, find the average of next to next 5 consecutive integers.
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7
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The average of 6 observations is 45.5. If one new observation is added to the previous observations, then the new average becomes 47. The new observation is :
Solution 
8
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The average annual income (in Rs.) of certain agricultural workers is S and that of other workers is T. The number of agricultural workers is 11 times that of other workers. Then the average monthly income (in Rs.) of all the workers is
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9
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A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3. Find his average after 17th inning.
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10
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The average of 25 results is 18. The average of first 12 of those is 14 and the average of last 12 is 17. What is the 13th result?
Solution 
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