The average of 8 numbers is 20. The average of first two numbers is $$15\frac{1}{2}$$ and that of the next three is $$21…

The average age of mother and her six children is 12 years, which is reduced by 5 years if the age of mother is excluded…

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…

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

The average weight of 47 balls is 4 g. if the weight of the bag (in which the balls are kept) be included; the calculate…

The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then …

If a, b, c, d, e are five consecutive odd numbers, their average is :

30 pens and 75 pencils altogether were purchased for Rs. 510. If the average price of a pencil was Rs. 2, what was the a…