Question

A student scored 72 out of 100 on a test. if the maximum score on the next test is also 100 what score would he need to keep an average of 81

Answer 1

72 + x = 2(81)
multiply 2(81)

72 + x = 162
subtract 72 from both sides

x = 90

He would need to score 90% on his next test.