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The mean of 5 observations is 60, mean of 10 observations is 30 and mean of 15 observations is 20. The mean of all 30 observations is-


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A school has 4 sections of chemistry in Class X having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the 4 sections. Determine the overall average of marks per student.

The mean of 5 observations is 60, mean of 10 observations is 30 and mean of 15 observations is 20. The mean of all 30 observations is-

In a class there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of the girls in the class 13 years. What is the average age of the whole class (rounded to two digits after decimal) ?

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 all the 30 observations is-

Averages Aptitude Questions

Arithmetic-Aptitude