Question

Maria scored 72, 97, and 82 on her first three math tests. She wants to have a mean score of 82 for the quarter. How many points does she need on her last test to earn an 82 for the quarter

Answer 1

72+97+82+ X/ 4 = 82                  72+97+82+X = 328 You multiply both sides by 4 because you are trying to isolate the variable. Then add up the values, 251+X= 328. Then subtract 251 from both sides too get X=77.

Answer 2

equation to solve: (72+97+82+p)/4 = 82

72+97+82+p = 82*4 = 328 => p = 328-72-97-82 = 77