Averages

The average weight of $12$ sacks of chili is $90\ kg$ each. If in it $6$ shacks of equal weight is added to it then the average weight sacks is $75\ kg$. Find the weight of each chili sack?

The average weight of $20$ students was calculated $70$ kg. It was later discovered that one weight was misread as $70$ instead of $90$, the correct average in kg is

The average weight of a class of $24$ students is $35$ kg. If the weight of the teacher be included, then the average rises by $400$ g. What is the weight of the teacher?

The average of a collection of $ 20$ measurements was calculated to be $56$ cm. But later it was found that a mistake occured in one of the measurements which was recorded as $ 64$ cm but should have been $ 61$ cm. What is the correct average?

There are $30$ students in a class. The average age of the first $10$ students is $12.5$ years. The average age of the remaining $20$ students is $13.1$ years. What is the average age (in years) of the students of the whole class?

The average age of $15 $ students of a class is $15$ years. Out of these, the average age of $5$ students is $14$ years and that of the other nine students is $16$ years. What is the age of the 15th student?

The average of 20 numbers is 12. The average of the first 12 numbers is 11 and that of the next 7 numbers is 10. The last number is

If the average weight of $6$ students is $50$ kg, that of $2$ students is $51$ kg and that of rest of $2$ students is $55$ kg, then the average weight of all the students is

The average age of $24$ boys and a teacher is $15$ . When the teacher' age is excluded the average decreases by $ 1$. What is the age of the teacher?

A student was asked to find the average of the following $12 $ numbers :$ 3, 11, 7, 9 , 15, 13, 8, 19, 17, 21, 14\ and \ x.$ He found the average to be $12$. What should come in place of x?

The average weight of $8$ men is increased by $1.5$ kg, when one of the men who weight $65$ kg is replaced by a new man. The weight of the new man is

The average marks obtained by five students A, B, C, D, and E is $\displaystyle 52\frac{3}{5}$ and the average marks obtained by A,C, and D are $\displaystyle 53\frac{2}{3}$, and the average marks Obtained by B , C and E are $\displaystyle 52\frac{3}{3}$, then the marks obtained by C were

The average score of two sections is 28. The average score of section A is 30, in which there are 25 students, If there are 20 students in section B then the average score of section B is

In a competitive examination, the average marks obtained was 45. It was later discovered that there was some error in compurerisation and the marks of 90 candidates has to be changed from 80 to 50 and the average came down to 40 marks. The total number of candidates who appeared in examination is