document.write( "Question 827392: if you have test scores of 75, 82, and 91 what would the fourth test have to be to get an 80 as your average \n" ); document.write( "

Algebra.Com's Answer #498673 by TimothyLamb(4379) $\"\"$ $\"About$

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\n" ); document.write( "(75 + 82 + 91 + x)/4 = 80
\n" ); document.write( "248 + x = 80*4
\n" ); document.write( "x = 80*4 - 248
\n" ); document.write( "x = 72
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