SOLUTION: If Christina Makes a 80, 84, and 72 on her report card, what grade must she make on her last quarter to make an 85 average?

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Question 437898: If Christina Makes a 80, 84, and 72 on her report card, what grade must she make on her last quarter to make an 85 average?
Found 2 solutions by josmiceli, jorel1380:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = the grade she needs
+%28+80+%2B+84+%2B+72+%2B+x%29+%2F+4+=+85+
+80+%2B+84+%2B+72+%2B+x+=+340+
+236+%2B+x+=+340+
+x+=+104+
Looks like she can't do it unless she gets a 104

Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
80+84+72+x/4=85
236+x=340
x=340-236
x=104.