document.write( "Question 315550: Kim’s average score on her first three math tests is 78. She scored 63 on the first test. On the third test, she scored 9 more than he scored on her second test. What did she score on the second and third tests? Set up an equation, then solve and explain. \n" ); document.write( "

Algebra.Com's Answer #225769 by Fombitz(32388) $\"\"$ $\"About$

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Let S be the score from the second test, T the score from the third.
\n" ); document.write( " $\"+%2863%2BT%2BS%29%2F3=78\"$
\n" ); document.write( " $\"+63%2BT%2BS=234\"$
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( " $\"+T=S%2B9\"$
\n" ); document.write( " $\"+63%2B%28S%2B9%29%2BS=234\"$
\n" ); document.write( " $\"+2S%2B72=234\"$
\n" ); document.write( " $\"+2S=162\"$
\n" ); document.write( " $\"+highlight%28S=81%29\"$
\n" ); document.write( "Then from above,
\n" ); document.write( " $\"+T=S%2B9\"$
\n" ); document.write( " $\"+T=81%2B9\"$
\n" ); document.write( " $\"+highlight%28T=90%29+\"$
\n" ); document.write( " \n" ); document.write( "

\n" );