document.write( "Question 1024248: average age of 25 students is 17 years. If we add the age of teacher also, average age increase by one year. The age of a teacher in years is? \n" ); document.write( "

Algebra.Com's Answer #639676 by josmiceli(19441) $\"\"$ $\"About$

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In words:
\n" ); document.write( "[ average of ages ] = [ total of ages ] / [ number of individuals ]
\n" ); document.write( "--------------------
\n" ); document.write( "Let $\"+t+\"$ = total of ages
\n" ); document.write( "Average for just the students:
\n" ); document.write( " $\"+17+=+t+%2F+25+\"$
\n" ); document.write( " $\"+t+=+425+\"$
\n" ); document.write( "The student's ages total $\"+425+\"$
\n" ); document.write( "-----------------------------
\n" ); document.write( "Let $\"+x+\"$ = the teacher's age
\n" ); document.write( "Add in the teacher to same formula:
\n" ); document.write( " $\"+17+%2B+1+=+%28+425+%2B+x+%29+%2F+%28+25+%2B+1+%29+\"$
\n" ); document.write( " $\"+18+=+%28+425+%2B+x+%29+%2F+26+\"$
\n" ); document.write( " $\"+425+%2B+x+=+468+\"$
\n" ); document.write( " $\"+x+=+43+\"$
\n" ); document.write( "The teacher is 43
\n" ); document.write( "---------------
\n" ); document.write( "check answer:
\n" ); document.write( " $\"+%28+425+%2B+43+%29+%2F+26+=+18+\"$
\n" ); document.write( " $\"+468+=+26%2A18+\"$
\n" ); document.write( " $\"+468+=+468+\"$
\n" ); document.write( "OK \n" ); document.write( "

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