document.write( "Question 640806: on three test I scored 84 65 76 what grade must I obtain on the fourth test to equal 80 for all for test \n" ); document.write( "

Algebra.Com's Answer #403409 by nerdybill(7384) $\"\"$ $\"About$

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on three test I scored 84 65 76 what grade must I obtain on the fourth test to equal 80 for all for test
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\n" ); document.write( "Assuming all four tests are equally weighted...
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\n" ); document.write( "Let x = score on fourth test
\n" ); document.write( "then
\n" ); document.write( "(84 + 65 + 76 + x)/4 = 80
\n" ); document.write( "(225 + x)/4 = 80
\n" ); document.write( "225 + x = 320
\n" ); document.write( "x = 320-225
\n" ); document.write( "x = 95
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