document.write( "Question 768660: A student has an average of 72% in 9 tests that she wrote. She still needs to write one more test and wants to achieve a total average of 75%. What percentage must she get for the last teste? \n" ); document.write( "

Algebra.Com's Answer #468463 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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A student has an average of 72% in 9 tests that she wrote.
\n" ); document.write( " She still needs to write one more test and wants to achieve a total average of 75%.
\n" ); document.write( " What percentage must she get for the last test?
\n" ); document.write( ":
\n" ); document.write( "Let x = the grade of the last test
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\n" ); document.write( "The last test is only 10% of the total grade, therefore
\n" ); document.write( " $\"%289%2872%29+%2B+x%29%2F10\"$ = 75
\n" ); document.write( "648 + x = 750
\n" ); document.write( "x = 750 - 648
\n" ); document.write( "x = !02% so it may not be possible \n" ); document.write( "

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