Brittany got a 78 on her first test. After her second test, her average rose to an 81. What grade did she get on her second test?
First multiply her average grade by the number of tests she took to find the total number of points she scored: 81 points * 2 = <<81*2=162>>162 points
Then subtract the number of points she scored on her first exam to find how many points she scored on her second exam: 162 points - 78 points = <<162-78=84>>84 points
#### 84