question: If John scored 100 on his first 3 tests and an 80 on his 4th, what was his average score across the 4 tests?
answer: 100+100+100+80=<<100+100+100+80=380>>380 total score across 4 tests
  380 total score / 4 tests = <<380/4=95>>95 average score
  #### 95