document.write( "Question 292454: The average mark on the first 3 tests Jean took was 76. What average mark does Jean need on the next two tests to have an average of 80 for all of the tests? \n" ); document.write( "

Algebra.Com's Answer #211320 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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The average mark on the first 3 tests Jean took was 76.
\n" ); document.write( " What average mark does Jean need on the next two tests to have an average
\n" ); document.write( " of 80 for all of the tests?
\n" ); document.write( ":
\n" ); document.write( "Let x = value required on the last two tests to average an 80 for all 5 tests
\n" ); document.write( ":
\n" ); document.write( " $\"%283%2876%29+%2B+2x%29%2F5\"$ = 80
\n" ); document.write( "Multiply both sides by 5
\n" ); document.write( "228 + 2x = 5(80)
\n" ); document.write( "2x = 400 - 228
\n" ); document.write( "2x = 172
\n" ); document.write( "x = $\"172%2F2\"$
\n" ); document.write( "x = 86 the average required on the last two tests. \n" ); document.write( "

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