document.write( "Question 1178853: if the scores for three tests are 96, 98, and 86, what must the scores on a fourth test be to make the average 90
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Algebra.Com's Answer #808282 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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f the scores for three tests are 96, 98, and 86,
\n" ); document.write( " what must the scores on a fourth test be to make the average 90
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\n" ); document.write( "let x = the score of the 4th test
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\n" ); document.write( " $\"%28%28x+%2B+96+%2B+98+%2B+86%29%29%2F4\"$ = 90
\n" ); document.write( " $\"%28%28x+%2B+280%29%29%2F4\"$ = 90
\n" ); document.write( "Multiply both sides by 4
\n" ); document.write( "x + 280 = 360
\n" ); document.write( "x = 360 - 280
\n" ); document.write( "x = 80 score will give an average of 90
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\n" ); document.write( "You can confirm this, add up the 4 scores and divide by 4 \n" ); document.write( "

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