document.write( "Question 1145067: The sum of the ages of clarence and his father is 39. After four years,his father's age would be one less than 5 times his age . What are their present ages?
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Algebra.Com's Answer #766253 by josmiceli(19441)\"\" \"About 
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Let \"+a+\" = Clarence's age now
\n" ); document.write( "Let \"+b+\" = his father's age now
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\n" ); document.write( "(1) \"+a+%2B+b+=+39+\"
\n" ); document.write( "(2) \"+b+%2B+4+=+5%2A%28+a+%2B+4+%29+-+1+\"
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\n" ); document.write( "(2) \"+b+%2B+4+=+5a+%2B+20+-+1+\"
\n" ); document.write( "(2) \"+5a+-+b+=+-19+%2B+4+\"
\n" ); document.write( "(2) \"+5a+-+b+=+-15+\"
\n" ); document.write( "Add (1) and (2)
\n" ); document.write( "\"+6a+=+24+\"
\n" ); document.write( "\"+a+=+4+\"
\n" ); document.write( "and
\n" ); document.write( "(1) \"+4+%2B+b+=+39+\"
\n" ); document.write( "(1) \"+b+=+35+\"
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\n" ); document.write( "Clarence is 4
\n" ); document.write( "His father is 35
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\n" ); document.write( "check:
\n" ); document.write( "(2) \"+b+%2B+4+=+5%2A%28+a+%2B+4+%29+-+1+\"
\n" ); document.write( "(2) \"+35+%2B+4+=+5%2A%28+4+%2B+4+%29+-+1+\"
\n" ); document.write( "(2) \"+39+=+5%2A8+-+1+\"
\n" ); document.write( "(2) \"+39+=+39+\"
\n" ); document.write( "OK
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