Posted by **Amy~** on Friday, September 17, 2010 at 11:13pm.

Going into the final exam which will count as two-thirds of the final grade, Mike has test scores of 86,80,84,and 90. What score does he need on the final to earn an average score of 80?

Is this right:

(86+80+84+90)/4 = 80

2/3x(85)= 80

or ((86+80+84+90+(2/3x))/5 = 80

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