The average of four consecutive even numbers is 9. Find the largest number. 

The average of 11 numbers is 7. If each number is doubled, what will be the new average of the numbers?

The average mathematics marks of two Sections A and B of class IX 131 the annual examination is 74. The average marks of Section A is 77.5 and that of Section B is 70. The ratios of the number of students of Section A and B is:

A supermarket has sales of ₹1,48,500, ₹2,00,000, ₹1,64,000, ₹1,88,600 and ₹2,40,400 in 5 consecutive months. How much sales should the supermarket have in the 6th month so that the average sales for these 6 months become ₹1,88,300?

The average of 5 consecutive even numbers is A. If next 5 even numbers are also included, then what is the average of these 10 numbers?

The average of 10 numbers is 14. If each number is multiplied by 6 then what will be the new average?

The average of 10 observations is 21. A new observation is included and the average of these 11 numbers is 1 less than the prevoius average. The 11^th observation is____

The average weight of 12 parcels is 1.8 kg. Addition of another new parcel reduces the average weight by 50 g. What is the weight of the new parcel?