If the average of m numbers is n<sup>2</sup> and that of n numbers is m<sup>2</sup> , then the …

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases…

The average of runs of a cricket player of 10 innings was 32. How many runes must be made in his next innings so as to i…

Distance between two stations A and B is 778km. A train covers the journey from A to B at 84 km per hour and returns bac…

The mean of 50 numbers is 30. Later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 a…

Average age of ten persons learning yoga is 32 years. When the age of their instructor is added, the average age becomes…

The mean of 25 observations was found to be 78.4. But later on it was found that 96 were misread as 69. The correct mean…

A school has 4 sections of chemistry in Class X having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry …