Question 26492
Let the sum of Adam's seven test scores = x.  Let's find the sum.

{{{x/6 = 84}}} Multiply by both sides by 6.
{{{x = 504}}}

The sum of Adam's seven test scores is 504.  To find the correct average, you'll divide this sum by the number of scores, or 7.
Let A = Adam's correct average.
{{{A = 504/7}}}
{{{A = 72}}}

Adam's correct average test score is 72.