Question

tim scores 12, 7,10,6,9 and he wants an average of 9, how much does he need for the next score to keep 9 as his average.
6 8 10 4 12

Answer 1

let he score 'x' in his next test.
there are total 6 numbers, so to get average, you do
(12+7+10+6+9+x)/6 =9
find x from here.