document.write( "Question 956895: Ben is 25 years younger than his father. His mother is 2 years younger than his father. Their total ages add up to 78 years how old is Ben? \n" ); document.write( "

Algebra.Com's Answer #584673 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
(1) $\"+b+=+f+-+25+\"$
\n" ); document.write( "(2) $\"+m+=+f+-+2+\"$
\n" ); document.write( "(3) $\"+b+%2B+f+%2B+m+=+78+\"$
\n" ); document.write( "------------------------
\n" ); document.write( "Substitute (1) and (2) into (3)
\n" ); document.write( "(3) $\"+f+-+25+%2B+f+%2B+f+-+2+=+78+\"$
\n" ); document.write( "(3) $\"+3f+-+27+=+78+\"$
\n" ); document.write( "(3) $\"+3f+=+105+\"$
\n" ); document.write( "(3) $\"+f+=+35+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+b+=+f+-+25+\"$
\n" ); document.write( "(1) $\"+b+=+35+-+25+\"$
\n" ); document.write( "(1) $\"+b+=+10+\"$
\n" ); document.write( "-------------------
\n" ); document.write( "Ben is 10
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+m+=+f+-+2+\"$
\n" ); document.write( "(2) $\"+m+=+35+-+2+\"$
\n" ); document.write( "(2) $\"+m+=+33+\"$
\n" ); document.write( "and
\n" ); document.write( "(3) $\"+b+%2B+f+%2B+m+=+78+\"$
\n" ); document.write( "(3) $\"+10+%2B+35+%2B+33+=+78+\"$
\n" ); document.write( "(3) $\"+78+=+78+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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