The mean of the first ten even natural number is-

What is the average of the first six (positive) odd number each of which is divisible by 7?

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 las…

The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean scor…

The mean of 5 observations is 60, the mean of 10 observations is 30 and the mean of 15 observations is 20. The mean of a…

The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weig…

The average temperature for the first four days of a week is 40.2° C and that of the last four days is 41.3° C. …

3 years age, the average age of a family of 5 members was 17 years. A baby having been born, the average age of the fami…