The mean of 50 observations was calculated as 75. It was later found that one of the observations was misread as 173 instead of 113. The correct mean is...
There are 15 numbers such that average of first 12 numbers is 30 while the average of last five numbers is 48. Find the 12th number, if the ratio betwee...
The average cost price of 21 pens (having equal cost price) decreased by Rs.3, when one of the pen is replaced by a new pen having cost price of Rs.55. ...
The average age of three children is 20 years. If their ages are in the ratio 1:2:3. Find the age of the youngest child.
The average age of a group of eight children is 9 years. Two children, whose ages were 7 years more and 5 years more than the average age, left. Two new...
Average of nine consecutive numbers is 56. Find the sum of smallest and largest number.
What is the average of the squares of the first 41 natural numbers?
The average age of three children is 20 years. If their ages are in the ratio 4:5:6. Find the age of the youngest child.
Three numbers are given such that when the average of any two numbers is added to the third number, the resulting sums are 450, 420, and 400. Determine ...
There are 15 numbers such that average of first 12 numbers is 50 while the average of last five numbers is 60. Find the 12th number, if the ratio betwee...
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