There were 35 students in a hostel. Due to the admission of 7 new student, the expenses of the mess were increased by Rs. 42 per day, while the average expenditure per head diminished by Re 1. What was the original expenditure of the mess?
432
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420
415
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1
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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 
2
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The average of four consecutive even numbers is 15. The 2nd highest number is :
Solution 
3
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Four years ago, the average age of a family of four persons was 18 years. During this period, a baby was born. Today if the average age of the family is still 18 years, the age of the baby is
Solution 
4
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A student finds the average of 10 positive integers. Each integer contains two digits. By mistake, the boy interchanges the digits of one number say ba for ab. Due to this, the average becomes 1.8 less than the previous one. What was the difference of the two digits a and b?
Solution 
5
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The average of 50 numbers is 30. If two numbers, 35 and 40 are discarded, then the average of the remaining numbers is nearly:
Solution 
6
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The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observation is 
Solution 
7
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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
Solution 
8
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The average age of P, Q and R is 15 years more than R's age. If the total age of P and Q together is 39 years, then R's age is ?
Solution 
9
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The average age of three boys is 15 years. If their ages are in ratio 3 : 5 : 7, the age of the youngest boy is
Solution 
10
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The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then
Solution 
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