Question 1056559
 John recently scored a 96 on a 100 point test.
 This score brought up his overall test average 3 percentage points to 81%.
 How many tests has John’s class taken in total if every test was 100 points?
:
Before the test his average was 3 points less or 78
let n = number test he took before the 96
{{{((78n + 96))/((n+1))}}} = 81
78n + 96 = 81(n+1)
78n + 96 = 81n + 81
96 - 81 = 81n - 78n 
15 = 3n
n = 15/3
n = 5 test before he got the 96
"How many tests has John’s class taken in total?"
6 tests