document.write( "Question 452131: The Average (arithmetic mean) of a student's scores on 4 tests was 77. If he recieved a score of 69 on each of the first two tests and an 82 on the third, what was his score on the fourth test? \n" ); document.write( "

Algebra.Com's Answer #310848 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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The Average (arithmetic mean) of a student's scores on 4 tests was 77.
\n" ); document.write( " If he recieved a score of 69 on each of the first two tests and an 82 on the
\n" ); document.write( " third, what was his score on the fourth test?
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\n" ); document.write( "let x = fourth test score
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\n" ); document.write( " $\"%282%2869%29+%2B+82+%2B+x%29%2F4\"$ = 77
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\n" ); document.write( " $\"%28220+%2B+x%29%2F4\"$ = 77
\n" ); document.write( "multiply both sides by 4
\n" ); document.write( "220 + x = 4(77)
\n" ); document.write( "x = 308 - 220
\n" ); document.write( "x = 88 on the 4th test
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\n" ); document.write( "You can check this
\n" ); document.write( " $\"%2869+%2B+69+%2B+82+%2B+88%29%2F4\"$ =
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