The average of seven numbers is 18. If one of the number is 17 and if it is replaced by 31, then the average becomes: 

In a class of 66 students there are 33 girls. The average weight of these girls is 61 Kg and average weight of the full class is 66 kgs. What is the average weight of the boys of the class?

The average price of three furniture items is Rs 15,000. If the ratio of their prices is 3: 5: 7, then the cheapest furniture price is-

Eight consecutive numbers are given. If the average of the two numbers that appear in the middle is 6, then the sum of the eight given numbers is: 

The average of four consecutive even numbers is 15. The 2nd highest number is: 

A certain sum is deposited for 4 years at a rate of 10% per annum on compound interest compounded annually. The difference between ihe interest at the end of 2 years and that at the end of 4 years is ₹5,082. Find the sum (in ₹).

A company produces an average of 4000 items per month for the first 3 months. How much items, it must produce on an average per month over the next 9 months to get average of 4375 items per month over the whole year? 

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 the weight (in kg) of B is