Average of a, b, and c is 11; average of c, d and e is 17; average of e and f is 22 and average of e and c is 17. Find out the average of a, b, c, d, e and f.
\(15\frac{2}{3}\)
\(18\frac{1}{2}\)
\(16\frac{1}{2}\)
None of these
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1
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Out of four numbers the average of the first three is 16 and that of the last three is 15. If the last number is 20, than first number is :
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2
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The average of a group of men is increased by 5 years when a person aged of 18 years is replaced by a new person of aged 38 years. How many men are there in the group?
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3
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The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5°C. If the mean of the whole week is 25.2°C then the temperature of the 4th day is :
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4
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The average age of group of 20 girls is 15 years and that of another group of 25 boys it is 24 years. The average age of the two groups mixed together is :
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5
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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 :
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6
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Find the average of the following sets of scores:385, 441, 876, 221, 536, 46, 291, 428
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7
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The average marks obtained by a class of 60 students is 65. The average marks of half of the students is found to be 85. The average marks of the remaining students is :
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8
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Mean of 10 numbers is 30. Later on it was observed that numbers 15, 23 are wrongly taken as 51, 32. The correct mean is :
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9
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The average age of a family with 5 members is 28. If one of the 5 members of age 20 is excluded the average age of the family becomes 
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10
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A shop of electronic goods is closed on Monday. The average daily sales for remaining six days of a week is Rs. 15,640 and the average sale of Tuesday to Saturday is Rs. 14,124. The sales on Sunday is 
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