The average age of a man and his son is 55 years. The ratio of their ages is 7 : 4, respectively. What will be the ratio of their ages after 6 years?

The average (rounded off to two decimal place) of the squares of the first 84 natural numbers is

The average of the squares of the first 82 natural numbers is

The average of the squares of the first 83 natural numbers is

The average price of three items of furniture is ₹5045. If their prices are in the ratio 3:5:7, the price of the costliest item (in ₹) is

The average weight of Shivam, Rupesh and Mandar is 45 kg. If the average weight of Shivam and Rupesh is 38 kg and the average weight of Rupesh and Mandar is 50 kg, then find Rupesh's weight (in kg).

A grocer has a sale of Rs.6635, Rs.7127, Rs.7055, Rs.7430 and Rs.6462 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs.6700? (In Rs.)

In a class, the number of boys is 40% more than that of girls. In an examination, the average marks obtained by boys is 20% less than the average marks obtained by girls. If the average marks obtained by all the boys and girls is 53, then what is the average marks obtained by the boys ?