average of 10 numbers is 9 and average of 9 numbers is 9.3. What will be the 10th number.

M4maths Previous Puzzles

31 Aug 2012 average

average of 10 numbers is 9 and average of 9 numbers is 9.3. What will be the 10th number.

OPtion

1) 9
2) 9.3
3) 6
4) 6.3
5) 5
6) 5.6
7) 3.9
8) 10.2
9) 8.9
10) none of these

Solution

average of 10 numbers is 9 so total = 90
average of 9 numbers is 9.3 so total = 83.7
so 10th number = 90-83.7 = 6.3

Correct Option: 4 Best Solution (0)