document.write( "Question 982301: Ben is 3 times as old as Kevin and is also 10 years older than Kevin.
\n" ); document.write( "How old is Ben? \n" ); document.write( "

Algebra.Com's Answer #603137 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+b+\"$ = Ben's age
\n" ); document.write( "Let $\"+k+\"$ = Kevin's age
\n" ); document.write( "-----------------------
\n" ); document.write( "(1) $\"+b+=+3k+\"$
\n" ); document.write( "(2) $\"+b+=+k+%2B+10+\"$
\n" ); document.write( "--------------------
\n" ); document.write( "Substitute (1) into (2)
\n" ); document.write( "(2) $\"+3k+=+k+%2B+10+\"$
\n" ); document.write( "(2) $\"+2k+=+10+\"$
\n" ); document.write( "(2) $\"+k+=+5+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+b+=+3k+\"$
\n" ); document.write( "(1) $\"+b+=+3%2A5+\"$
\n" ); document.write( "(1) $\"+b+=+15+\"$
\n" ); document.write( "----------------
\n" ); document.write( "Ben is 15
\n" ); document.write( "----------
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+b+=+k+%2B+10+\"$
\n" ); document.write( "(2) $\"+15+=+5+%2B+10+\"$
\n" ); document.write( "(2) $\"+15+=+15+\"$
\n" ); document.write( "OK \n" ); document.write( "

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