document.write( "Question 1107896: John is four times as old as clarence. If their combined age is 30 years, how old is John? \n" ); document.write( "

Algebra.Com's Answer #722922 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+a+\"$ = John's age now
\n" ); document.write( "Let $\"+b+\"$ = Clarence's age now
\n" ); document.write( "---------------------------------
\n" ); document.write( "(1) $\"+a+=+4b+\"$
\n" ); document.write( "(2) $\"+a+%2B+b+=+30+\"$
\n" ); document.write( "---------------------------
\n" ); document.write( "Plug (1) into (2)
\n" ); document.write( "(2) $\"+4b+%2B+b+=+30+\"$
\n" ); document.write( "(2) $\"+5b+=+30+\"$
\n" ); document.write( "(2) $\"+b+=+6+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+a+=+4b+\"$
\n" ); document.write( "(1) $\"+a+=+4%2A6+\"$
\n" ); document.write( "(1) $\"+a+=+24+\"$
\n" ); document.write( "---------------------
\n" ); document.write( "John is 24
\n" ); document.write( "Clarence is 6
\n" ); document.write( " \n" ); document.write( "

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