Question 566416
A stuent received scores of 51, 79, and 57 on their first three tests for a class.
 There will be a total of four tests for the class and the student hopes to acheive and average score of n in the class.
 Express the score, S, needed on the fourth test to acheive this average, as a function of n.
:
{{{((s+51+79+57))/4}}} = n
s + 187 = 4n
s = 4n - 187