The mean of 14 observations is 11. One more observation is included and the new mean becomes 12. The 15th observation is

There are 4 companies named – A, B, C and D. the number of employees working in the companies is 20, 30, 25 and 15 respectively. Also the average age of employees of companies – A, B, C and D are 25 years, 22 years, 20 years and 27 years respectively. Find the average age of all the employees of all the four companies.

What is the average of first 30 multiples of 9?

A pupil’s marks were wrongly entered as 85 instead of 75. Due to that the average marks for the class got increased by one-third (1/3). The number of pupils in the class is

The average monthly expenditure of a family for the first four months is Rs. 2570, for the next three months Rs. 2490 and for the last five months Rs. 3030. If the family saves Rs. 5320 during the whole year, the average monthly income of the family during the year is

The average salary per head of all the workers in a company is Rs. 90. The average salary of 12 officers is Rs. 520 and the average salary per head of the rest is Rs. 80. Find the total number of workers in the workshop.

A batsman’s average increases by 3 on scoring 87 runs in his 17th innings. His new average is

The mean of 100 items was found to be 30. If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11, then find the correct mean.

The average of two numbers is 62. If 2 is added to the smaller number, then the ratio between smaller number to larger number becomes 1 : 2. What is the smaller number?

The average age of 5 children of a family is 11 years. The average age of their parents and grandmother is 35 years. Find the average age of all the eight members of the family?

The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. Then find the 11th observation?

In a class of 60 students, half of them have an average height of 160 cm and one third have an average height of 162 cm. What should be the height of remaining students so that average height of class is 161.2 cm?

The average of age of grandfather and grandmother is 65 years. If the age of granddaughter is included, the average of the three falls to 50. Find the age of granddaughter.

What is the average of the following set of numbers? 112, 102, 133, 116 and 127

The average salary, per head, of all the employees of an institution, is Rs. 60. The average salary of 12 officers is Rs. 400; the average salary, per head, of the rest is Rs. 56. The total number of employees in the institution is

The average of five positive numbers is 319.20. The average of first two numbers is 482.5 and the average of last two numbers is 258.5. What is the number after interchanging hundredth place digit and unit place digit of the third number?

A man worked 15 hours a day for the first 4 days, 14 hours a day for the next 3 days but did not work on the 8th day. Then on the average how much did he work in the first eight days?

The average age of 31 students in a class is 16 years. It the age of their teacher is 48 years, what is the average age of the students and teacher combined?

The average of six numbers is 20. If one number is removed, the average becomes 15. What is the number removed?