A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a m…

A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found me…

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

The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then…

The average of five different positive numbers is 25. x is the decrease in the average when the smallest number among th…

The average age of a family of 5 members is 20 years. If the age of the youngest member be 10 years then what was the av…

The average of 50 numbers is 38. If the numbers 45 and 55 are discarded, then the average of the remaining numbers is-

The average weight of 3 men, A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If an…