Answer: 21
Explanation:
If every player on Mary’s Basketball team besides Mary scored 6points and there are 10 totals players than we can multiply 10 by 6 for the number of total points however this doesn’t equal 75 points. So you realize that Mary didn’t story 6 points so instead of 6*10 multiply 6 by 9 to get 54 and then subtract 75 - 54 which will give you the total number of points Mary scored. 75-54 = 21 which means Mary scored 21 points