posted by Ej .
Mary scored 89 on her first test and 92 on her second test, 98 on the third, and 95 on the fourth. She has one more test to take. If she wants to have an average of 100 on all five sets, what score should she get on her removal test?
let score of her last test be x
Review how an average is obtained and use that fact to form the equation, then solve for x
Let me know what you get.
btw, curious about that "removal" test. Are you replacing the lowest score with the last test?
In that case, there would be only four tests.