The average weight of five persons sitting in a boat is 38 kg. The average weight of the boat and the persons sitting in…

The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5&de…

In a class with a certain number of students, if one student weighting 50 kg is added then the average weight of the cla…

A library has an average of 510 visitors on Sundays and 240 on other days. What is the average number of visitors per da…

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…

The average of five numbers is 306.4. The average of the first two numbers is 431 and the average of the last two number…

The body weight of seven students of a class is recorded as 54 kg, 78 kg, 43 kg, 82 kg, 67 kg, 42 kg and 75 kg. What is …

A student finds the average of 10 positive integers. Each integer contains two digits. By mistake, the boy interchanges …