The average of twenty-five numbers is 18, the average of first twelve is 14 and that of last twelve is 17. The thirteenth number is

The average of 25 results is 18. The average of first twelve of them is 14 and that of last twelve is 17, the thirteenth result is:

The average of 15 numbers is 18. The average of first 8 is 19 and that last 8 is 17, then the 8th number is

The average of fourteen numbers is 46. The average of first five is 43 and that of last six numbers is 49.5. The sixth and seventh numbers are respectively 4 and 8 greater than the eighth number. What is the average of sixth and seventh numbers?

The average of three numbers is 6. The average of the first two is 5 while the average of the last two is 8. The three numbers are:

The average of six numbers is 30. If the average of first four is 25 and that of last three is 35, the fourth number is:

The average of nine numbers is 50. The average of the first five numbers is 54 and that of the last three numbers is 52. Then, the sixth number is

The average of five numbers is 58. The average of first two numbers is 48.5 and the average of last two numbers is 53.5. Find the third number.