SOLUTION: Solving with equalities I don't understand how to put this into an equation to solve: College Course Load To remain on financial aid, Millie needs to complete an average of a

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Question 72760This question is from textbook Developmental Mathematics
: Solving with equalities
I don't understand how to put this into an equation to solve:
College Course Load To remain on financial aid, Millie needs to complete an average of at least 7 credits per quarter each year. In the first three quarters of 2001, Millie completed 5,7, and 8 credits. How many credits of course work must Millie complete in the fourth quarter if she is to remain on financial aid?This question is from textbook Developmental Mathematics

Answer by ptaylor(1894) About Me  (Show Source):
You can put this solution on YOUR website!

Let x=number of credits needed in the fourth quarter to remain on financial aid
So our equation to solve is:
%285%2B7%2B8%2Bx%29%2F4=7 collect like terms
%2820%2Bx%29%2F4=7 multiply both sides by 4
%2820%2Bx%29=28 subtract 20 from both sides
20-20%2Bx=28-20
x=8
CK %285%2B7%2B8%2B8%29%2F4=7
28%2F4=7
7=7
Hope this helps----ptaylor